1.
GHS hazard pictograms
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Hazard pictograms form part of the international Globally Harmonized System of Classification and Labelling of Chemicals. Two sets of pictograms are included within the GHS, one for the labelling of containers and for workplace hazard warnings, either one or the other is chosen, depending on the target audience, but the two are not used together. The two sets of use the same symbols for the same hazards, although certain symbols are not required for transport pictograms. Transport pictograms come in variety of colors and may contain additional information such as a subcategory number. It has still to be implemented by the European Union in 2009, the following pictograms are included in the Worldwide Model Using but have not been incorporated into the GHS, ICZ and Catwallsh Hazcom Labelling because of the nature of the hazards. Globally Harmonized System of Classification and Labelling of Chemicals, New York and Geneva, United Nations,2007, ISBN 978-92-1-116957-7, ST/SG/AC. 10/30/Rev. Model Regulations, New York and Geneva, United Nations,2007, ISBN 978-92-1-139120-6, manual of Tests and Criteria, New York and Geneva, United Nations,2002, ISBN 92-1-139087-7, ST/SG/AC. 10/11/Rev.4 GHS pictogram gallery from the United Nations Economic Commission for Europe
2.
Solid
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Solid is one of the four fundamental states of matter. It is characterized by structural rigidity and resistance to changes of shape or volume, unlike a liquid, a solid object does not flow to take on the shape of its container, nor does it expand to fill the entire volume available to it like a gas does. The atoms in a solid are tightly bound to other, either in a regular geometric lattice or irregularly. The branch of physics deals with solids is called solid-state physics. Materials science is concerned with the physical and chemical properties of solids. Solid-state chemistry is concerned with the synthesis of novel materials, as well as the science of identification. The atoms, molecules or ions which make up solids may be arranged in a repeating pattern. Materials whose constituents are arranged in a regular pattern are known as crystals, in some cases, the regular ordering can continue unbroken over a large scale, for example diamonds, where each diamond is a single crystal. Almost all common metals, and many ceramics, are polycrystalline, in other materials, there is no long-range order in the position of the atoms. These solids are known as amorphous solids, examples include polystyrene, whether a solid is crystalline or amorphous depends on the material involved, and the conditions in which it was formed. Solids which are formed by slow cooling will tend to be crystalline, likewise, the specific crystal structure adopted by a crystalline solid depends on the material involved and on how it was formed. While many common objects, such as an ice cube or a coin, are chemically identical throughout, for example, a typical rock is an aggregate of several different minerals and mineraloids, with no specific chemical composition. Wood is an organic material consisting primarily of cellulose fibers embedded in a matrix of organic lignin. In materials science, composites of more than one constituent material can be designed to have desired properties, the forces between the atoms in a solid can take a variety of forms. For example, a crystal of sodium chloride is made up of sodium and chlorine. In diamond or silicon, the atoms share electrons and form covalent bonds, in metals, electrons are shared in metallic bonding. Some solids, particularly most organic compounds, are together with van der Waals forces resulting from the polarization of the electronic charge cloud on each molecule. The dissimilarities between the types of solid result from the differences between their bonding, metals typically are strong, dense, and good conductors of both electricity and heat
3.
Liquid
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A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a constant volume independent of pressure. As such, it is one of the four states of matter. A liquid is made up of tiny vibrating particles of matter, such as atoms, water is, by far, the most common liquid on Earth. Like a gas, a liquid is able to flow and take the shape of a container, most liquids resist compression, although others can be compressed. Unlike a gas, a liquid does not disperse to fill every space of a container, a distinctive property of the liquid state is surface tension, leading to wetting phenomena. The density of a liquid is usually close to that of a solid, therefore, liquid and solid are both termed condensed matter. On the other hand, as liquids and gases share the ability to flow, although liquid water is abundant on Earth, this state of matter is actually the least common in the known universe, because liquids require a relatively narrow temperature/pressure range to exist. Most known matter in the universe is in form as interstellar clouds or in plasma form within stars. Liquid is one of the four states of matter, with the others being solid, gas. Unlike a solid, the molecules in a liquid have a greater freedom to move. The forces that bind the molecules together in a solid are only temporary in a liquid, a liquid, like a gas, displays the properties of a fluid. A liquid can flow, assume the shape of a container, if liquid is placed in a bag, it can be squeezed into any shape. These properties make a suitable for applications such as hydraulics. Liquid particles are bound firmly but not rigidly and they are able to move around one another freely, resulting in a limited degree of particle mobility. As the temperature increases, the vibrations of the molecules causes distances between the molecules to increase. When a liquid reaches its point, the cohesive forces that bind the molecules closely together break. If the temperature is decreased, the distances between the molecules become smaller, only two elements are liquid at standard conditions for temperature and pressure, mercury and bromine. Four more elements have melting points slightly above room temperature, francium, caesium, gallium and rubidium, metal alloys that are liquid at room temperature include NaK, a sodium-potassium metal alloy, galinstan, a fusible alloy liquid, and some amalgams
4.
Gas
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Gas is one of the four fundamental states of matter. A pure gas may be made up of atoms, elemental molecules made from one type of atom. A gas mixture would contain a variety of pure gases much like the air, what distinguishes a gas from liquids and solids is the vast separation of the individual gas particles. This separation usually makes a colorless gas invisible to the human observer, the interaction of gas particles in the presence of electric and gravitational fields are considered negligible as indicated by the constant velocity vectors in the image. One type of commonly known gas is steam, the gaseous state of matter is found between the liquid and plasma states, the latter of which provides the upper temperature boundary for gases. Bounding the lower end of the temperature scale lie degenerative quantum gases which are gaining increasing attention, high-density atomic gases super cooled to incredibly low temperatures are classified by their statistical behavior as either a Bose gas or a Fermi gas. For a comprehensive listing of these states of matter see list of states of matter. The only chemical elements which are stable multi atom homonuclear molecules at temperature and pressure, are hydrogen, nitrogen and oxygen. These gases, when grouped together with the noble gases. Alternatively they are known as molecular gases to distinguish them from molecules that are also chemical compounds. The word gas is a neologism first used by the early 17th-century Flemish chemist J. B. van Helmont, according to Paracelsuss terminology, chaos meant something like ultra-rarefied water. An alternative story is that Van Helmonts word is corrupted from gahst and these four characteristics were repeatedly observed by scientists such as Robert Boyle, Jacques Charles, John Dalton, Joseph Gay-Lussac and Amedeo Avogadro for a variety of gases in various settings. Their detailed studies ultimately led to a relationship among these properties expressed by the ideal gas law. Gas particles are separated from one another, and consequently have weaker intermolecular bonds than liquids or solids. These intermolecular forces result from interactions between gas particles. Like-charged areas of different gas particles repel, while oppositely charged regions of different gas particles attract one another, transient, randomly induced charges exist across non-polar covalent bonds of molecules and electrostatic interactions caused by them are referred to as Van der Waals forces. The interaction of these forces varies within a substance which determines many of the physical properties unique to each gas. A comparison of boiling points for compounds formed by ionic and covalent bonds leads us to this conclusion, the drifting smoke particles in the image provides some insight into low pressure gas behavior
5.
Organism
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In biology, an organism is any contiguous living system, such as an animal, plant, fungus, protist, archaeon, or bacterium. All known types of organisms are capable of some degree of response to stimuli, reproduction, growth and development and homeostasis. An organism consists of one or more cells, when it has one cell it is known as an organism. Most unicellular organisms are of microscopic scale and are thus described as microorganisms. Humans are multicellular organisms composed of trillions of cells grouped into specialized tissues. An organism may be either a prokaryote or a eukaryote, prokaryotes are represented by two separate domains—bacteria and archaea. Eukaryotic organisms are characterized by the presence of a cell nucleus. Fungi, animals and plants are examples of kingdoms of organisms within the eukaryotes, estimates on the number of Earths current species range from 10 million to 14 million, of which only about 1.2 million have been documented. More than 99% of all species, amounting to five billion species. In 2016, a set of 355 genes from the last universal ancestor of all living organisms living was identified. The term organism first appeared in the English language in 1703 and it is directly related to the term organization. There is a tradition of defining organisms as self-organizing beings. An organism may be defined as an assembly of molecules functioning as a more or less stable whole that exhibits the properties of life. Dictionary definitions can be broad, using such as any living structure, such as a plant, animal, fungus or bacterium, capable of growth. Many definitions exclude viruses and possible man-made non-organic life forms, as viruses are dependent on the machinery of a host cell for reproduction. A superorganism is an organism consisting of individuals working together as a single functional or social unit. There has been controversy about the best way to define the organism, several contributions are responses to the suggestion that the category of organism may well not be adequate in biology. Viruses are not typically considered to be organisms because they are incapable of autonomous reproduction and this controversy is problematic because some cellular organisms are also incapable of independent survival and live as obligatory intracellular parasites
6.
United States
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Forty-eight of the fifty states and the federal district are contiguous and located in North America between Canada and Mexico. The state of Alaska is in the northwest corner of North America, bordered by Canada to the east, the state of Hawaii is an archipelago in the mid-Pacific Ocean. The U. S. territories are scattered about the Pacific Ocean, the geography, climate and wildlife of the country are extremely diverse. At 3.8 million square miles and with over 324 million people, the United States is the worlds third- or fourth-largest country by area, third-largest by land area. It is one of the worlds most ethnically diverse and multicultural nations, paleo-Indians migrated from Asia to the North American mainland at least 15,000 years ago. European colonization began in the 16th century, the United States emerged from 13 British colonies along the East Coast. Numerous disputes between Great Britain and the following the Seven Years War led to the American Revolution. On July 4,1776, during the course of the American Revolutionary War, the war ended in 1783 with recognition of the independence of the United States by Great Britain, representing the first successful war of independence against a European power. The current constitution was adopted in 1788, after the Articles of Confederation, the first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties. During the second half of the 19th century, the American Civil War led to the end of slavery in the country. By the end of century, the United States extended into the Pacific Ocean. The Spanish–American War and World War I confirmed the status as a global military power. The end of the Cold War and the dissolution of the Soviet Union in 1991 left the United States as the sole superpower. The U. S. is a member of the United Nations, World Bank, International Monetary Fund, Organization of American States. The United States is a developed country, with the worlds largest economy by nominal GDP. It ranks highly in several measures of performance, including average wage, human development, per capita GDP. While the U. S. economy is considered post-industrial, characterized by the dominance of services and knowledge economy, the United States is a prominent political and cultural force internationally, and a leader in scientific research and technological innovations. In 1507, the German cartographer Martin Waldseemüller produced a map on which he named the lands of the Western Hemisphere America after the Italian explorer and cartographer Amerigo Vespucci
7.
United Kingdom
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The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom or Britain, is a sovereign country in western Europe. Lying off the north-western coast of the European mainland, the United Kingdom includes the island of Great Britain, Northern Ireland is the only part of the United Kingdom that shares a land border with another sovereign state—the Republic of Ireland. The Irish Sea lies between Great Britain and Ireland, with an area of 242,500 square kilometres, the United Kingdom is the 78th-largest sovereign state in the world and the 11th-largest in Europe. It is also the 21st-most populous country, with an estimated 65.1 million inhabitants, together, this makes it the fourth-most densely populated country in the European Union. The United Kingdom is a monarchy with a parliamentary system of governance. The monarch is Queen Elizabeth II, who has reigned since 6 February 1952, other major urban areas in the United Kingdom include the regions of Birmingham, Leeds, Glasgow, Liverpool and Manchester. The United Kingdom consists of four countries—England, Scotland, Wales, the last three have devolved administrations, each with varying powers, based in their capitals, Edinburgh, Cardiff and Belfast, respectively. The relationships among the countries of the UK have changed over time, Wales was annexed by the Kingdom of England under the Laws in Wales Acts 1535 and 1542. A treaty between England and Scotland resulted in 1707 in a unified Kingdom of Great Britain, which merged in 1801 with the Kingdom of Ireland to form the United Kingdom of Great Britain and Ireland. Five-sixths of Ireland seceded from the UK in 1922, leaving the present formulation of the United Kingdom of Great Britain, there are fourteen British Overseas Territories. These are the remnants of the British Empire which, at its height in the 1920s, British influence can be observed in the language, culture and legal systems of many of its former colonies. The United Kingdom is a country and has the worlds fifth-largest economy by nominal GDP. The UK is considered to have an economy and is categorised as very high in the Human Development Index. It was the worlds first industrialised country and the worlds foremost power during the 19th, the UK remains a great power with considerable economic, cultural, military, scientific and political influence internationally. It is a nuclear weapons state and its military expenditure ranks fourth or fifth in the world. The UK has been a permanent member of the United Nations Security Council since its first session in 1946 and it has been a leading member state of the EU and its predecessor, the European Economic Community, since 1973. However, on 23 June 2016, a referendum on the UKs membership of the EU resulted in a decision to leave. The Acts of Union 1800 united the Kingdom of Great Britain, Scotland, Wales and Northern Ireland have devolved self-government
8.
Canada
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Canada is a country in the northern half of North America. Canadas border with the United States is the worlds longest binational land border, the majority of the country has a cold or severely cold winter climate, but southerly areas are warm in summer. Canada is sparsely populated, the majority of its territory being dominated by forest and tundra. It is highly urbanized with 82 per cent of the 35.15 million people concentrated in large and medium-sized cities, One third of the population lives in the three largest cities, Toronto, Montreal and Vancouver. Its capital is Ottawa, and other urban areas include Calgary, Edmonton, Quebec City, Winnipeg. Various aboriginal peoples had inhabited what is now Canada for thousands of years prior to European colonization. Pursuant to the British North America Act, on July 1,1867, the colonies of Canada, New Brunswick and this began an accretion of provinces and territories to the mostly self-governing Dominion to the present ten provinces and three territories forming modern Canada. With the Constitution Act 1982, Canada took over authority, removing the last remaining ties of legal dependence on the Parliament of the United Kingdom. Canada is a parliamentary democracy and a constitutional monarchy, with Queen Elizabeth II being the head of state. The country is officially bilingual at the federal level and it is one of the worlds most ethnically diverse and multicultural nations, the product of large-scale immigration from many other countries. Its advanced economy is the eleventh largest in the world, relying chiefly upon its abundant natural resources, Canadas long and complex relationship with the United States has had a significant impact on its economy and culture. Canada is a country and has the tenth highest nominal per capita income globally as well as the ninth highest ranking in the Human Development Index. It ranks among the highest in international measurements of government transparency, civil liberties, quality of life, economic freedom, Canada is an influential nation in the world, primarily due to its inclusive values, years of prosperity and stability, stable economy, and efficient military. While a variety of theories have been postulated for the origins of Canada. In 1535, indigenous inhabitants of the present-day Quebec City region used the word to direct French explorer Jacques Cartier to the village of Stadacona, from the 16th to the early 18th century Canada referred to the part of New France that lay along the St. Lawrence River. In 1791, the area became two British colonies called Upper Canada and Lower Canada collectively named The Canadas, until their union as the British Province of Canada in 1841. Upon Confederation in 1867, Canada was adopted as the name for the new country at the London Conference. The transition away from the use of Dominion was formally reflected in 1982 with the passage of the Canada Act, later that year, the name of national holiday was changed from Dominion Day to Canada Day
9.
Radioactive decay
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A material containing such unstable nuclei is considered radioactive. Certain highly excited short-lived nuclear states can decay through neutron emission, or more rarely, however, for a collection of atoms, the collections expected decay rate is characterized in terms of their measured decay constants or half-lives. This is the basis of radiometric dating, the half-lives of radioactive atoms have no known upper limit, spanning a time range of over 55 orders of magnitude, from nearly instantaneous to far longer than the age of the universe. A radioactive nucleus with spin can have no defined orientation. If there are multiple particles produced during a single decay, as in decay, their relative angular distribution. Such a parent process could be a previous decay, or a nuclear reaction, the decaying nucleus is called the parent radionuclide, and the process produces at least one daughter nuclide. Except for gamma decay or internal conversion from an excited state. When the number of changes, an atom of a different chemical element is created. The first decay processes to be discovered were alpha decay, beta decay, alpha decay occurs when the nucleus ejects an alpha particle. This is the most common process of emitting nucleons, but highly excited nuclei can eject single nucleons, or in the case of cluster decay, specific light nuclei of other elements. Beta decay occurs when the nucleus emits an electron or positron, the nucleus may capture an orbiting electron, causing a proton to convert into a neutron in a process called electron capture. All of these result in a well-defined nuclear transmutation. By contrast, there are radioactive decay processes that do not result in a nuclear transmutation, another type of radioactive decay results in products that vary, appearing as two or more fragments of the original nucleus with a range of possible masses. For a summary table showing the number of stable and radioactive nuclides in each category, there are 29 naturally occurring chemical elements on Earth that are radioactive. They are those that contain 34 radionuclides that date before the time of formation of the solar system, well-known examples are uranium and thorium, but also included are naturally occurring long-lived radioisotopes, such as potassium-40. Radioactivity was discovered in 1896 by the French scientist Henri Becquerel and these materials glow in the dark after exposure to light, and he suspected that the glow produced in cathode ray tubes by X-rays might be associated with phosphorescence. He wrapped a photographic plate in black paper and placed various phosphorescent salts on it, all results were negative until he used uranium salts. The uranium salts caused a blackening of the plate in spite of the plate being wrapped in black paper and these radiations were given the name Becquerel Rays
10.
Combustibility and flammability
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Combustibility is a measure of how easily a substance will set on fire, through fire or combustion. This is an important property to consider when a substance is used for construction or is being stored and it is also important in processes that produce combustible substances as a by-product. Special precautions are required for substances that are easily combustible. These measures may include installation of fire sprinklers or storage remote from possible sources of ignition, substances with low combustibility may be selected for construction where the fire risk needs to be reduced, such as apartment buildings, houses, or offices. If combustible resources are used there is chance of fire accidents. Fire resistant substances are preferred for building materials and furnishings, for an Authority Having Jurisdiction, combustibility is defined by the local code. BS 476-4,1970 defines a test for combusibility in which 3 specimens of a material are heated in a furnace, otherwise, the material shall be deemed combustible. Various countries have tests for determining noncombustibility of materials, most involve the heating of a specified quantity of the test specimen for a set duration. Usually, the material cannot support combustion and must not undergo a loss of mass. In Canada, for instance, firewalls must be made of concrete, in building construction, buildings are typically divided into combustible and noncombustible ones. Combustible structures have more stringent limits on building height and area. A number of industrial processes produce combustible dust as a by-product, the most common being wood dust. In addition to wood, combustible dusts include metals, especially magnesium, titanium and aluminum, there are at least a 140 known substances that produce combustible dust. While the particles in a combustible dusts may be of any size, as of 2012, the United States Occupational Safety and Health Administration has yet to adopt a comprehensive set of rules on combustible dust. When suspended in air, the particles of combustible dust present a potential for explosions. Accumulated dust, even when not suspended in air, remains a fire hazard, collectors designed to reduce airborne dust account for more than 40 percent of all dust explosions. Other important processes are grinding and pulverizing, transporting powders, filing silos and containers, investigation of 200 dust explosions and fires, between 1980 to 2005, indicated approximately 100 fatalities and 600 injuries. In January 2003, a powder explosion and fire at the West Pharmaceutical Services plant in Kinston, North Carolina resulted in the deaths of six workers
11.
Explosive material
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An explosive charge is a measured quantity of explosive material, which may be composed of a single ingredient or a combination of two or more. Materials that detonate are said to be high explosives and materials that deflagrate are said to be low explosives, Explosives may also be categorized by their sensitivity. Sensitive materials that can be initiated by a small amount of heat or pressure are primary explosives. A wide variety of chemicals can explode, a number are manufactured specifically for the purpose of being used as explosives. The remainder are too dangerous, sensitive, toxic, expensive, unstable, in contrast, some materials are merely combustible or flammable if they burn without exploding. The distinction, however, is not razor-sharp, though early thermal weapons, such as Greek fire, have existed since ancient times, the first widely used explosive in warfare and mining was black powder, invented in 9th century China. This material was sensitive to water, and it produced copious amounts of dark smoke, the first useful explosive stronger than black powder was nitroglycerin, developed in 1847. Since nitroglycerin is a liquid and highly unstable, it was replaced by nitrocellulose, TNT in 1863, smokeless powder, dynamite in 1867, World War I saw the adoption of TNT trinitrotoluene in artillery shells. World War II saw a use of new explosives. In turn, these have largely replaced by more powerful explosives such as C-4. However, C-4 and PETN react with metal and catch fire easily, yet unlike TNT, C-4 and PETN are waterproof, the largest commercial application of explosives is mining. In Materials Science and Engineering, explosives are used in cladding, a thin plate of some material is placed atop a thick layer of a different material, both layers typically of metal. Atop the thin layer is placed an explosive, at one end of the layer of explosive, the explosion is initiated. The two metallic layers are forced together at high speed and with great force, the explosion spreads from the initiation site throughout the explosive. Ideally, this produces a metallurgical bond between the two layers and it is possible that some fraction of the surface material from either layer eventually gets ejected when the end of material is reached. Hence, the mass of the now welded bilayer, may be less than the sum of the masses of the two initial layers, there are applications where a shock wave, and electrostatics, can result in high velocity projectiles. Thus, explosives are substances that contain an amount of energy stored in chemical bonds. Consequently, most commercial explosives are compounds containing -NO2, -ONO2 and -NHNO2 groups that
12.
Corrosive substance
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A corrosive substance is one that will destroy and damage other substances with which it comes into contact. It may attack a variety of materials, including metals and various organic compounds. The word corrosive is derived from the Latin verb corrodere, which means to gnaw, sometimes the word caustic is used as a synonym but caustic generally refers only to strong bases, particularly alkalis, and not to acids, oxidizers, or other non-alkaline corrosives. A low concentration of a substance is usually an irritant. Corrosion of non-living surfaces such as metals is a distinct process, for example, a water/air electrochemical cell corrodes iron to rust. In the Globally Harmonized System, both rapid corrosion of metals and chemical corrosion of skin qualify for the corrosive symbol. Corrosives are different from poisons in that corrosives are immediately dangerous to the tissues they contact, colloquially, corrosives may be called poisons but the concepts are technically distinct. However, there is nothing which precludes a corrosive from being a poison, common corrosives are either strong acids, strong bases, or concentrated solutions of certain weak acids or weak bases. They can exist as any state of matter, including liquids, solids, gases and their action on living tissue is mainly based on acid-base reactions of amide hydrolysis, ester hydrolysis and protein denaturation. Proteins are destroyed via amide hydrolysis while lipids are decomposed by ester hydrolysis and these reactions lead to chemical burns and are the mechanism of the destruction posed by corrosives. Some corrosives possess other properties which may extend their corrosive effects on living tissue. For example, sulfuric acid at a concentration is also a strong dehydrating agent, capable of dehydrating carbohydrates. This results in secondary thermal burns in addition to the chemical burns, some corrosives, such as nitric acid and concentrated sulfuric acid, are strong oxidizing agents as well, which significantly contributes to the extra damage caused. Hydrofluoric acid does not necessarily cause noticeable damage upon contact, but produces tissue damage, zinc chloride solutions are capable of destroying cellulose and corroding through paper and silk since the zinc cations in the solutions specifically attack hydroxyl groups, acting as a Lewis acid. In addition, some chemicals, mostly acids such as hydrochloric acid and nitric acid, are volatile. Inhalation can damage the respiratory tract, corrosive substances are most hazardous to eyesight. A drop of a corrosive may cause blindness within 2–10 seconds through opacification or direct destruction of the cornea, ingestion of corrosives can induce severe consequences, including serious damage of the gastrointestinal tract, which can lead to vomiting, severe stomach aches, and death. Common corrosive chemicals are classified into, Acids Strong acids – the most common are acid, nitric acid
13.
Oxidizing agent
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In chemistry, an oxidizing agent is a substance that has the ability to oxidize other substances. Common oxidizing agents are oxygen, hydrogen peroxide and halogens, in one sense, an oxidizing agent is a chemical species that undergoes a chemical reaction that removes one or more electrons from another atom. In that sense, it is one component in an oxidation–reduction reaction, in the second sense, an oxidizing agent is a chemical species that transfers electronegative atoms, usually oxygen, to a substrate. Combustion, many explosives, and organic redox reactions involve atom-transfer reactions, electron acceptors participate in electron-transfer reactions. In this context, the agent is called an electron acceptor. A classic oxidizing agent is the ferrocenium ion Fe+2, which accepts an electron to form Fe2, one of the strongest acceptors commercially available is Magic blue, the radical cation derived from N3. Extensive tabulations of ranking the electron accepting properties of various reagents are available, in more common usage, an oxidising agent transfers oxygen atoms to a substrate. In this context, the agent can be called an oxygenation reagent or oxygen-atom transfer agent. Examples include MnO−4, CrO2−4, OsO4, and especially ClO−4, notice that these species are all oxides. In some cases, these oxides can also serve as electron acceptors, as illustrated by the conversion of MnO−4 to MnO2−4, by this definition some materials that are classified as oxidising agents by analytical chemists are not classified as oxidising agents in a dangerous materials sense. An example is potassium dichromate, which does not pass the dangerous goods test of an oxidising agent, the U. S. Department of Transportation defines oxidizing agents specifically. There are two definitions for oxidizing agents governed under DOT regulations and these two are Class 5, Division 5.1 and Class 5, Division 5.2. Division 5.1 means a material that may, generally by yielding oxygen, combustion Dye Electrosynthesis Organic oxidation Organic redox reaction Reducing agent
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Biological hazard
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Biological hazards, also known as biohazards, refer to biological substances that pose a threat to the health of living organisms, primarily that of humans. This can include medical waste or samples of a microorganism, virus or toxin that can affect human health and it can also include substances harmful to other animals. The term and its symbol are generally used as a warning. The biohazard symbol was developed in 1966 by Charles Baldwin, an engineer working for the Dow Chemical Company on the containment products. It is used in the labeling of biological materials that carry a significant health risk, including viral samples, in Unicode, the biohazard symbol is U+2623. Category B, UN3373 – Biological substance transported for diagnostic or investigative purposes, regulated Medical Waste, UN3291 – Waste or reusable material derived from medical treatment of an animal or human, or from biomedical research, which includes the production and testing. The United States Centers for Disease Control and Prevention categorizes various diseases in levels of biohazard, Level 1 being minimum risk, Laboratories and other facilities are categorized as BSL 1-4 or as P1 through P4 for short. Biohazard Level 1, Bacteria and viruses including Bacillus subtilis, canine hepatitis, Escherichia coli, varicella, as well as cell cultures. At this level precautions against the materials in question are minimal, most likely involving gloves. Routine diagnostic work with clinical specimens can be done safely at Biosafety Level 2, research work can be done in a BSL-2 facility, using BSL-3 practices and procedures. Variola virus is an agent that is worked with at BSL-4 despite the existence of a vaccine, when dealing with biological hazards at this level the use of a positive pressure personnel suit, with a segregated air supply, is mandatory. Multiple airlocks are employed and are secured to prevent both doors opening at the same time. All air and water going to and coming from a Biosafety Level 4 lab will undergo similar decontamination procedures to eliminate the possibility of an accidental release. Currently there are no bacteria classified at this level, the biohazard symbol was developed by the Dow Chemical Company in 1966 for their containment products. In an article he wrote for Science in 1967, the symbol was presented as the new standard for all biological hazards, the chosen symbol scored the best on nationwide testing for memorability. The design was first specified in 39 FR23680 but was dropped in the succeeding amendment, however, various US states adopted the specification for their state code. Biological agent Biosafety level Biocontainment Planetary protection and Interplanetary contamination Public health Biosafety in Microbiological and Biomedical Laboratories, Prevention of Biological Hazards, EU-OSHA Symbol Making, an account of the development of the symbol in 1966. BioSeal Systems, Biosafety level 4 containment, Biohazard Remediation Compliance Overview Example of Reclassified Biohazard to Level 4, article from The Lancet concerning the reclassification of Ebola after observation
15.
Toxicity
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Toxicity is the degree to which a substance can damage an organism. Toxicity can refer to the effect on an organism, such as an animal, bacterium, or plant, as well as the effect on a substructure of the organism. By extension, the word may be used to describe toxic effects on larger and more complex groups. Sometimes the word is more or less synonymous with poisoning in everyday usage, toxicity is species-specific, making cross-species analysis problematic. Newer paradigms and metrics are evolving to bypass animal testing, while maintaining the concept of toxicity endpoints, disease-causing microorganisms and parasites are toxic in a broad sense, but are generally called pathogens rather than toxicants. The biological toxicity of pathogens can be difficult to measure because the dose may be a single organism. Theoretically one virus, bacterium or worm can reproduce to cause a serious infection, in some cases, e. g. cholera, the disease is chiefly caused by a nonliving substance secreted by the organism, rather than the organism itself. Such nonliving biological toxicants are generally called toxins if produced by a microorganism, plant, or fungus, Physical toxicants are substances that, due to their physical nature, interfere with biological processes. Examples include coal dust, asbestos fibers or finely divided silicon dioxide, corrosive chemicals possess physical toxicity because they destroy tissues, but theyre not directly poisonous unless they interfere directly with biological activity. Water can act as a physical toxicant if taken in high doses because the concentration of vital ions decreases dramatically if theres too much water in the body. Asphyxiant gases can be considered physical toxicants because they act by displacing oxygen in the environment but they are inert, as already mentioned, radiation can have a toxic effect on organisms. Toxicity can be measured by its effects on the target, one such measure is the LD50. When such data does not exist, estimates are made by comparison to known similar toxic things, then, safety factors are added to account for uncertainties in data and evaluation processes. Similarly, an extra protection factor may be used for individuals believed to be susceptible to toxic effects such as in pregnancy or with certain diseases. Obviously, this approach is approximate, but such protection factors are deliberately very conservative. In addition, it is possible that a single cell transformed into a cell is all it takes to develop the full effect. Common mixtures include gasoline, cigarette smoke, and industrial waste, even more complex are situations with more than one type of toxic entity, such as the discharge from a malfunctioning sewage treatment plant, with both chemical and biological agents. The preclinical toxicity testing on various biological systems reveals the species-, organ-, the toxicity of substances can be observed by studying the accidental exposures to a substance in vitro studies using cells/ cell lines in vivo exposure on experimental animals
16.
Allergen
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An allergen is a type of antigen that produces an abnormally vigorous immune response in which the immune system fights off a perceived threat that would otherwise be harmless to the body. In technical terms, an allergen is a capable of stimulating a type-I hypersensitivity reaction in atopic individuals through Immunoglobulin E responses. Most humans mount significant Immunoglobulin E responses only as a defense against parasitic infections, however, some individuals may respond to many common environmental antigens. This hereditary predisposition is called atopy, in atopic individuals, non-parasitic antigens stimulate inappropriate IgE production, leading to type I hypersensitivity. Sensitivities vary widely from one person to another, a very broad range of substances can be allergens to sensitive individuals. Allergens can be found in a variety of sources, such as dust mite excretion, pollen, Food allergies are not as common as food sensitivity, but some foods such as peanuts, nuts, seafood and shellfish are the cause of serious allergies in many people. Officially, the United States Food and Drug Administration does recognize eight foods as being common for reactions in a large segment of the sensitive population. These include peanuts, tree nuts, eggs, milk, shellfish, fish, wheat and their derivatives, see the FDA website for complete details. Canada recognizes all eight of the allergens recognized by the US, and also recognizes sesame seeds, the European Union additionally recognizes celery. Various trees and wood products such as paper, cardboard, MDF etc. can also cause mild to severe allergy symptoms through touch or inhalation of sawdust such as asthma, other common causes of serious allergy are wasp, fire ant and bee stings, penicillin, and latex. An extremely serious form of a reaction is called anaphylaxis. This depends on the kind of tree or grass, for instance, some trees such as oak, elm, and maple pollinate in the spring, while grasses such as Bermuda, timothy and orchard pollinate in the summer. Grass allergy is generally linked to hay fever because their symptoms, symptoms include rhinitis, which causes sneezing and a runny nose, as well as allergic conjunctivitis, which includes watering and itchy eyes. Also an initial tickle on the roof of the mouth or in the back of the throat may be experienced, also, depending on the season, the symptoms may be more severe and people may experience coughing, wheezing, and irritability. A few people even become depressed, lose their appetite, or have problems sleeping, moreover, since the sinuses may also become congested, some people experience headaches. The immune system also has influence on seasonal allergies, since it reacts differently to diverse allergens like pollen. When an allergen enters the body of an individual that is predisposed to allergies, it triggers an immune reaction and these allergen antibodies migrate to mast cells lining the nose, eyes and lungs. Some symptoms that differentiate allergies from a cold include, No fever, mucous secretions are runny and clear
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France
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France, officially the French Republic, is a country with territory in western Europe and several overseas regions and territories. The European, or metropolitan, area of France extends from the Mediterranean Sea to the English Channel and the North Sea, Overseas France include French Guiana on the South American continent and several island territories in the Atlantic, Pacific and Indian oceans. France spans 643,801 square kilometres and had a population of almost 67 million people as of January 2017. It is a unitary republic with the capital in Paris. Other major urban centres include Marseille, Lyon, Lille, Nice, Toulouse, during the Iron Age, what is now metropolitan France was inhabited by the Gauls, a Celtic people. The area was annexed in 51 BC by Rome, which held Gaul until 486, France emerged as a major European power in the Late Middle Ages, with its victory in the Hundred Years War strengthening state-building and political centralisation. During the Renaissance, French culture flourished and a colonial empire was established. The 16th century was dominated by civil wars between Catholics and Protestants. France became Europes dominant cultural, political, and military power under Louis XIV, in the 19th century Napoleon took power and established the First French Empire, whose subsequent Napoleonic Wars shaped the course of continental Europe. Following the collapse of the Empire, France endured a succession of governments culminating with the establishment of the French Third Republic in 1870. Following liberation in 1944, a Fourth Republic was established and later dissolved in the course of the Algerian War, the Fifth Republic, led by Charles de Gaulle, was formed in 1958 and remains to this day. Algeria and nearly all the colonies became independent in the 1960s with minimal controversy and typically retained close economic. France has long been a centre of art, science. It hosts Europes fourth-largest number of cultural UNESCO World Heritage Sites and receives around 83 million foreign tourists annually, France is a developed country with the worlds sixth-largest economy by nominal GDP and ninth-largest by purchasing power parity. In terms of household wealth, it ranks fourth in the world. France performs well in international rankings of education, health care, life expectancy, France remains a great power in the world, being one of the five permanent members of the United Nations Security Council with the power to veto and an official nuclear-weapon state. It is a member state of the European Union and the Eurozone. It is also a member of the Group of 7, North Atlantic Treaty Organization, Organisation for Economic Co-operation and Development, the World Trade Organization, originally applied to the whole Frankish Empire, the name France comes from the Latin Francia, or country of the Franks
18.
Transport
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Transport or transportation is the movement of people, animals and goods from one location to another. Modes of transport include air, rail, road, water, cable, pipeline, the field can be divided into infrastructure, vehicles and operations. Transport is important because it enables trade between people, which is essential for the development of civilizations, terminals may be used both for interchange of passengers and cargo and for maintenance. Vehicles traveling on these networks may include automobiles, bicycles, buses, trains, trucks, people, helicopters, operations deal with the way the vehicles are operated, and the procedures set for this purpose including financing, legalities and policies. In the transport industry, operations and ownership of infrastructure can be public or private, depending on the country. Passenger transport may be public, where operators provide scheduled services, freight transport has become focused on containerization, although bulk transport is used for large volumes of durable items. Transport plays an important part in growth and globalization, but most types cause air pollution. While it is subsidized by governments, good planning of transport is essential to make traffic flow. A mode of transport is a solution that makes use of a type of vehicle, infrastructure. The transport of a person or of cargo may involve one mode or several of the modes, each mode has its own advantages and disadvantages, and will be chosen for a trip on the basis of cost, capability, and route. Human powered transport, a form of transportation, is the transport of people and/or goods using human muscle-power. Modern technology has allowed machines to enhance human power, human-powered vehicles have also been developed for difficult environments, such as snow and water, by watercraft rowing and skiing, even the air can be entered with human-powered aircraft. Animal-powered transport is the use of working animals for the movement of people, humans may ride some of the animals directly, use them as pack animals for carrying goods, or harness them, alone or in teams, to pull sleds or wheeled vehicles. A fixed-wing aircraft, commonly called airplane, is a craft where movement of the air in relation to the wings is used to generate lift. The term is used to distinguish this from rotary-wing aircraft, where the movement of the lift surfaces relative to the air generates lift, a gyroplane is both fixed-wing and rotary-wing. Fixed-wing aircraft range from small trainers and recreational aircraft to large airliners, two things necessary for aircraft are air flow over the wings for lift and an area for landing. The majority of aircraft also need an airport with the infrastructure to receive maintenance, restocking, refueling and for the loading and unloading of crew, cargo and passengers. While the vast majority of land and take off on land, some are capable of take off and landing on ice, snow
19.
Waste management
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Waste management or Waste disposal is all the activities and actions required to manage waste from its inception to its final disposal. This includes amongst other things, collection, transport, treatment and disposal of waste together with monitoring and it also encompasses the legal and regulatory framework that relates to waste management encompassing guidance on recycling etc. Waste management is intended to reduce effects of waste on health. Waste management practices are not uniform among countries, regions, there are a number of concepts about waste management which vary in their usage between countries or regions. The waste hierarchy remains the cornerstone of most waste minimisation strategies, the aim of the waste hierarchy is to extract the maximum practical benefits from products and to generate the minimum amount of waste, see, resource recovery. The waste hierarchy is represented as a pyramid because the premise is for policy to take action first. The next step or preferred action is to reduce the generation of waste i. e. by re-use, the next is recycling which would include composting. Following this step is material recovery and waste-to-energy, energy can be recovered from processes i. e. landfill and combustion, at this level of the hierarchy. The final action is disposal, in landfills or through incineration without energy recovery and this last step is the final resort for waste which has not been prevented, diverted or recovered. The waste hierarchy represents the progression of a product or material through the stages of the pyramid of waste management. The hierarchy represents the latter parts of the life-cycle for each product, the life-cycle begins with design, then proceeds through manufacture, distribution, use and then follows through the waste hierarchys stages of reduce, reuse and recycle. Each of the stages of the life-cycle offers opportunities for policy intervention, to rethink the need for the product, to redesign to minimize waste potential. The key behind the life-cycle of a product is to optimize the use of the limited resources by avoiding the unnecessary generation of waste. Resource efficiency reflects the understanding that current, global, economic growth, globally, we are extracting more resources to produce goods than the planet can replenish. Resource efficiency is the reduction of the impact from the production and consumption of these goods, from final raw material extraction to last use. This process of resource efficiency can address sustainability, the Polluter pays principle is a principle where the polluting party pays for the impact caused to the environment. With respect to management, this generally refers to the requirement for a waste generator to pay for appropriate disposal of the unrecoverable material. Throughout most of history, the amount of waste generated by humans was insignificant due to low population density, common waste produced during pre-modern times was mainly ashes and human biodegradable waste, and these were released back into the ground locally, with minimum environmental impact
20.
Fire department
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Other life safety services, such as technical rescue, hazardous materials, and emergency medical services may also be provided by the agency. In the United States a fire brigade is the private firefighting organization of a company or enterprise, a fire department usually contains one or more fire stations within its boundaries, and may be staffed by career firefighters, volunteer firefighters, or a combination thereof. A fire department may provide fire protection or fire prevention services, whereby firefighters visit homes and give fire safety advice. In many countries fire protection or prevention is seen as an important role for the service, as preventing a fire from occurring in the first place can save lives. Fire departments are organized in a system of administration, services, training, and operations, for example, Administration is responsible for supervision, budgets, policy, Service offers protection, safety, and education to the public. Training prepares skilled people with the knowledge to perform their duties, operations performs the tasks to successfully save the public from harm. Larger departments have branches within themselves to increase efficiency, composed of volunteers, support, volunteers give advantages to the department in a state of emergency. Support organizing the resources within and outside of the department, research is to give advantages in new technologies for the department. A fire departments jurisdiction is organized by the body that controls the department. This comes from a municipality, county, prefecture, state, province, the most common type of government control is at the municipality level. The jurisdiction size and organisation would be set up by a department or the government in charge of these duties and this deals with the placement of fire stations, equipment, and personnel within the area of control. Fire departments periodically survey their areas and use the data for redeploying proper coverage. This data comes from time, range from station, and/or a population survey. This brings equal service to the community and gives the department efficient places to launch operations. The earliest known firefighting service was formed in Ancient Rome by Egnatius Rufus who used his slaves to provide a fire service. These men fought fires using bucket chains and also patrolled the streets with the authority to impose corporal punishment upon those who violated fire-prevention codes, the Emperor Augustus established a public fire department in 24 BCE, composed of 600 slaves distributed amongst seven fire stations in Rome. Fire departments were formed by property insurance companies beginning in the 17th century after the Great Fire of London in 1666. The first insurance brigades were established the following year, each company had its own fire mark, a durable plaque that would be affixed to the building exterior
21.
Occupational exposure limit
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An occupational exposure limit is an upper limit on the acceptable concentration of a hazardous substance in workplace air for a particular material or class of materials. It is typically set by competent national authorities and enforced by legislation to protect occupational safety and it is an important tool in risk assessment and in the management of activities involving handling of dangerous substances. There are many dangerous substances for which there are no formal occupational exposure limits, in these cases, hazard banding or control banding strategies can be used to ensure safe handling. Occupational Exposure Limits have been established for airborne workplace chemicals by multiple regulatory, in the absence of OELs however, there are a variety of tools that can and should be used to assess exposure potential of workers. The Hierarchy of OELs provides a continuum of occupational exposure limit values that allow assessment of the risk of exposure in order to apply adequate controls, personal air sampling is routinely conducted on workers to determine whether exposures are acceptable or unacceptable. These samples are collected and analyzed using validated sampling and analytical methods and these methods are available from OSHA Technical Manual and NIOSH Manual of Analytical Methods Statistical tools are available to assess exposure monitoring data against OELs. The statistical tools are free but do require some previous knowledge with statistical concepts. A popular exposure data statistical tool called IH STAT is available from AIHA, IHSTAT has 14 languages including English and is available for free. Permissible exposure limit, set by the U. S, Occupational Safety and Health Administration Recommended exposure limit, set by the U. S. S. S. & Diwan, P. V. Industrial Guide to Chemical and Drug Safety, topping, M. Occupational Exposure Limits for Chemicals. Health and Safety Executive Research Report No, 172/2003 Occupational exposure limits and their economic costs by J Cherrie. Institute of Occupational Medicine Research Report TM/86/02 The IOM’s position on occupational exposure limits for dust Institute of Occupational Medicine Position Paper
22.
United Nations Economic and Social Council
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The ECOSOC serves as the central forum for discussing international economic and social issues, and for formulating policy recommendations addressed to member states and the United Nations system. A number of organisations have been granted consultative status to the Council to participate in the work of the United Nations. The president is elected for a term and chosen from the small or mid-sized powers represented on the ECOSOC. His Excellency Frederick Musiiwa Makamure Shava was elected seventy-second President of the Economic, Ambassador Shava is currently the Ambassador and Permanent Representative of the Republic of Zimbabwe to the United Nations in New York. The Council has 54 member states out of the 193 UN member states, UN secretary-general Ban Ki-moon added, Rather than viewing growth and sustainability as competing goals on a collision course, we must see them as complementary and mutually supportive imperatives. The report concluded that Business as usual is not an option, governance of the multilateral system has historically been complex and fragmented. This has limited the capacity of the ECOSOC to influence policies in trade, finance. Reform proposals aim to enhance the relevance and contribution of the council, a major reform was approved by the 2005 World Summit on the basis of proposals submitted by secretary-general Kofi Annan. At the Summit it was decided to hold annual ministerial-level substantive reviews to assess progress in achieving internationally agreed development goals. These Annual Ministeral Reviews will be replaced by the High Level Political Forum from 2016 onwards after the new post-MDG/Post-2015 Sustainable Development Goals are agreed. Subsequent proposals by the High-Level Panel Report on System-Wide Coherence in November 2006 aimed to establish a forum within the ECOSOC as a counter-model to the clubs of the G8. The Forum was to comprise 27 heads of state to meet annually and this proposal, however, was not approved by the General Assembly. The Economic and Social Council Chamber in the United Nations Conference Building was a gift from Sweden and it was conceived by Swedish architect Sven Markelius, one of the 11 architects in the international team that designed the UN headquarters. Wood from Swedish pine trees was used in the area for the railings
23.
International Civil Aviation Organization
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The International Civil Aviation Organization, is a specialized agency of the United Nations. It codifies the principles and techniques of international air navigation and fosters the planning and development of air transport to ensure safe. Its headquarters are located in the Quartier International of Montreal, Quebec, ICAO defines the protocols for air accident investigation followed by transport safety authorities in countries signatory to the Convention on International Civil Aviation. The Air Navigation Commission is the body within ICAO. The Commission is composed of 19 Commissioners, nominated by the ICAOs contracting states, Commissioners serve as independent experts, who although nominated by their states, do not serve as state or political representatives. The development of Aviation Standards and Recommended Practices is done under the direction of the ANC through the process of ICAO Panels. Once approved by the Commission, standards are sent to the Council, the forerunner to ICAO was the International Commission for Air Navigation. It held its first convention in 1903 in Berlin, Germany, at the second convention in 1906, also held in Berlin,27 countries attended. The third convention, held in London in 1912 allocated the first radio callsigns for use by aircraft, ICAN continued to operate until 1945. Fifty-two countries signed the Convention on International Civil Aviation, also known as the Chicago Convention, in Chicago, Illinois, on 7 December 1944. Under its terms, a Provisional International Civil Aviation Organization was to be established, accordingly, PICAO began operating on 6 June 1945, replacing ICAN. The 26th country ratified the Convention on 5 March 1947 and, consequently PICAO was disestablished on 4 April 1947 and replaced by ICAO, in October 1947, ICAO became an agency of the United Nations linked to the United Nations Economic and Social Council. In April 2013 Qatar offered to serve as the new permanent seat of the Organization, according to the Globe and Mail, Qatars move was at least partly motivated by the pro-Israel foreign policy of Canadian Prime Minister Stephen Harper. Approximately one month later, Qatar withdrew its bid after a proposal to the ICAOs governing council to move the ICAO triennial conference to Doha was defeated by a vote of 22–14. The 9th edition of the Convention on International Civil Aviation includes modifications from 1948 up to year 2006, ICAO refers to its current edition of the Convention as the Statute, and designates it as ICAO Document 7300/9. The Convention has 19 Annexes that are listed by title in the article Convention on International Civil Aviation, as of March 2016, there are 191 ICAO members, consisting of 190 of the 193 UN members, plus the Cook Islands. Liechtenstein has delegated Switzerland to implement the treaty to make it applicable in the territory of Liechtenstein, Taiwan attended the 38th Session of the ICAO Assembly in 2013, but in 2016 was denied such an invitation, despite expressions of support from the United States for Taiwan to participate. However, the Republic of China under the name of Chinese Taipei is a member of International Air Transport Association, the Council of ICAO is elected by the Assembly every 3 years and consists of 36 members elected in 3 categories
24.
International Air Transport Association
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The International Air Transport Association is a trade association of the world’s airlines. Consisting of 268 airlines, primarily major carriers, representing 117 countries, IATA supports airline activity and helps formulate industry policy and standards. It is headquartered in Montreal, Canada with Executive Offices in Geneva, IATA was formed in April 1945 in Havana, Cuba. It is the successor to the International Air Traffic Association, which was formed in 1919 at The Hague, at its founding, IATA consisted of 57 airlines from 31 countries. The Chicago Convention couldn’t resolve the issue of who flies where, however, the benchmark standard for the early bilaterals was the 1946 United States-United Kingdom Bermuda Agreement. IATA was also charged by the governments with setting a coherent fare structure that avoided cut-throat competition, the first Traffic Conference was held in 1947 in Rio de Janeiro and reached unanimous agreement on some 400 resolutions. Aviation grew rapidly over the decades and IATA’s work duly expanded. Safety is the number one priority for IATA, the main instrument for safety is the IATA Operational Safety Audit. IOSA has also been mandated at the level by several countries. In 2012, aviation posted its safest year ever, the global Western-built jet accident rate was 0.20, the equivalent of one accident every 5 million flights. Future improvements will be founded on data sharing with a database fed by a multitude of sources, in June 2014 the IATA set up a special panel to study measures to track aircraft in flight in real time. The move was in response to the disappearance without trace of Malaysia Airlines Flight 370 on 8 March 2014, security has become increasingly important following the September 11 attacks in 2001. Following a series of uncoordinated rules by different countries, the industry has developed a Checkpoint of the Future, simplifying the Business was launched in 2004. This initiative has introduced a number of concepts to passenger travel, including the electronic ticket. Many other innovations are being established as part of the Fast Travel initiative, an innovative program, launched in 2012 is New Distribution Capability. This will replace the pre-Internet EDIFACT messaging standard that is still the basis of the distribution system /travel agent channel. This will enable the same choices to be offered to high street travel shoppers as are offered to those who book directly through airline websites, a filing with the US Department of Transportation brought over 400 comments. At the 69th IATA annual general meeting in Cape Town, South Africa, IATA provides consulting and training services in many areas crucial to aviation
25.
International Maritime Organization
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The IMO was established in Geneva in 1948 and came into force ten years later, meeting for the first time in 1959. Headquartered in London, United Kingdom, the IMO has 172 Member States, IMO is governed by an assembly of members and is financially administered by a council of members elected from the assembly. The work of IMO is conducted through five committees and these are supported by technical subcommittees, other UN organisations may observe the proceedings of the IMO. Observer status is granted to qualified non-governmental organisations, IMO is supported by a permanent secretariat of employees who are representative of the organisations members. Hitherto such international conventions had been initiated piecemeal, notably the Safety of Life at Sea Convention, the first meetings of the newly formed IMCO were held in London in 1959. More recently SOLAS has been amended to bring a focus on maritime security through the International Ship. The IMO has also increased its focus on air emissions from ships, in January 1959, IMO began to maintain and promote the 1954 OILPOL Convention. Under the guidance of IMO, the convention was amended in 1962,1969, as oil trade and industry developed, many people in the industry began to recognize a need for further improvements in regards to oil pollution prevention at sea. Among other things, the accident forced the industry and public to question the efficacy of standing regulations. This incident prompted a series of new conventions, IMO held an emergency session of its Council to deal with the need to readdress regulations pertaining to maritime pollution. In 1969, the IMO Assembly decided to host a gathering in 1973 dedicated to this issue. The goal at hand was to develop an international agreement for controlling general environmental contamination by ships out at sea. During the next few years IMO brought to the forefront a series of measures designed to prevent large ship accidents and it also detailed how to deal with the environmental threat caused by routine ship duties such as the cleaning of oil cargo tanks or the disposal of engine room wastes. Interestingly enough in terms of tonnage the afore-mentioned was a problem than accidental pollution. The most significant thing to come out of conference was the International Convention for the Prevention of Pollution from Ships,1973. It covers not only accidental and operational oil pollution but also different types of pollution by chemicals, goods in packaged form, sewage, garbage, the original MARPOL was signed on 17 February 1973, but did not come into force due to lack of ratifications. The current convention is a combination of 1973 Convention and the 1978 Protocol and it entered into force on 2 October 1983. As of May 2013,152 states, representing 99.2 per cent of the worlds shipping tonnage, are involved in the convention, in 1983 the IMO established the World Maritime University in Malmö, Sweden
26.
International Maritime Dangerous Goods Code
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IMDG Code or International Maritime Dangerous Goods Code is accepted as an international guideline to the safe transportation or shipment of dangerous goods or hazardous materials by water on vessel. IMDG Code is intended to protect members and to prevent marine pollution in the safe transportation of hazardous materials by vessel. It is recommended to governments for adoption or for use as the basis for national regulations and it is intended for use not only by the mariner but also by all those involved in industries and services connected with shipping. Contains advice on terminology, packaging, labeling, placarding, markings, stowage, segregation, handling, the HNS Convention covers hazardous and noxious substances that are included in the IMDG code. The code is updated and maintained by the CCC Sub-Committee of the International Maritime Organization every 2 years, the correct edition to the IMDG Code is the 2014 Edition, Incorporating Amendment 37-12. This edition was applied on a voluntary basis starting 1 January 2015, the 2016 Edition, Incorporating Amendment 38-14, will be voluntary on 1 January 2017 and will become mandatory on 1 January 2018
27.
HNS Convention
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The HNS Convention is an international convention created in 1996 to compensate for damages caused by spillage of hazardous and noxious substances during maritime transportation. The convention is known as the International Convention on Liability. The convention has not entered into due to signatory states not meeting the ratification requirements. Canada, France, Germany, Greece, the Netherlands, Norway, in May 1996, the International Maritime Organization organized an international conference in London, where states adopted the HNS Convention. The convention is based on the model of the 1992 International Convention on Civil Liability for Oil Pollution Damage, in 2009, the convention had still not entered into force due to an insufficient number of ratification. In 2010, an international conference adopted a protocol to the convention. The protocol was designed to overcome some problems that had discouraged states from ratifying the original convention. An HNS is a such as chemicals, which could threaten humans and marine life and interfere with legitimate uses of the sea. Under the convention, it does not include crude oil, for example, the substances listed under International Maritime Dangerous Goods Code are considered HNS. The lists and codes include several thousand substances, many substances are covered under more than one category. Oils, as defined in regulation 1 of annex I to MARPOL 73/78 Noxious liquid substances and these substances are also subject to the provisions of the IMDG Code in effect in 1996 The convention also distinguishes substances based on whether they are transported in bulk or in packaged form. Bulk HNS include solids and liquids, such as oils and liquefied gases, packaged HNS include dangerous, hazardous and harmful materials and articles in packaged form, which fall under the International Maritime Dangerous Goods Code. A free online database of hazardous and noxious substances is available to verify whether a substance is considered hazardous or noxious, the database also provides information on classification criteria. The HNS convention establishes a system for compensation in the event of accidents at sea involving hazardous and noxious substances. Tier one will be covered by the ship owners compulsory insurance, the ship owner will be able to limit his financial liability to an amount between 10 million and 100 million SDR, which is approximately between USD15 million to USD150 million. The amount depends on the tonnage of the ship involved in the incident. If damage is caused by packaged HNS, the liability for the ship owner is 115 million SDR. In cases where the insurance is insufficient, a tier of compensation will be paid from the HNS fund
28.
Placard
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A placard is a notice installed in a public place, like a small card, sign, or plaque. It can be attached to or hung from a vehicle or building to indicate information about the operator or contents of a vehicle or building. It can also refer to paperboard signs or notice carried by picketers or demonstrators, a placard is placed on a building to indicate special information about that building. Temporary placards may be placed on such as warning signs over tenting to indicate the building is being fumigated. The two most common placards in general use on vehicles are disabled parking permits for personal automobiles, there are other types, such as the wide load signs used when mobile homes are transported by road. To see the signs put on trucks and trains meaning hazmats see, in computer graphical user interfaces, a placard is a rectangular area of a window meant for displaying information to the user. In Model United Nations, the nameplate of a delegation is referred to as a placard. Affair of the Placards,17 October 1534 anti-Catholic incident where posters appeared in places in five major French cities which brought an end to the conciliatory policies of King Francis I. Election placard Poster The dictionary definition of placard at Wiktionary Media related to Placards at Wikimedia Commons
29.
TNT
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Trinitrotoluene, or more specifically 2,4, 6-trinitrotoluene, is a chemical compound with the formula C6H23CH3. This yellow-colored solid is used as a reagent in chemical synthesis. The explosive yield of TNT is considered to be the measure of bombs. In chemistry, TNT is used to charge transfer salts. TNT was first prepared in 1863 by German chemist Julius Wilbrand and its potential as an explosive was not appreciated for several years, mainly because it was so difficult to detonate and because it was less powerful than alternatives. Its explosive properties were first discovered by another German chemist, Carl Häussermann, the German armed forces adopted it as a filling for artillery shells in 1902. The British started replacing lyddite with TNT in 1907, TNT is still widely used by the United States military, as well as construction companies around the world. The majority of TNT currently used by the US military is manufactured by Radford Army Ammunition Plant near Radford, in industry, TNT is produced in a three-step process. First, toluene is nitrated with a mixture of sulfuric and nitric acid to produce mononitrotoluene, the MNT is separated and then renitrated to dinitrotoluene. In the final step, the DNT is nitrated to trinitrotoluene using a mixture of nitric acid. Nitric acid is consumed by the process, but the diluted sulfuric acid can be reconcentrated and reused. The rinse water from sulphitation is known as red water and is a significant pollutant, control of nitrogen oxides in feed nitric acid is very important because free nitrogen dioxide can result in oxidation of the methyl group of toluene. This reaction is exothermic and carries with it the risk of a runaway reaction leading to an explosion. In the laboratory,2,4, 6-trinitrotoluene is produced by a two-step process, a nitrating mixture of concentrated nitric and sulfuric acids is used to nitrate toluene to a mixture of mono- and di-nitrotoluene isomers, with careful cooling to maintain temperature. The nitrated toluenes are then separated, washed with dilute sodium bicarbonate to remove oxides of nitrogen, towards the end of the nitration, the mixture is heated on a steam bath. The trinitrotoluene is separated, washed with a solution of sodium sulfite. TNT is one of the most commonly used explosives for military, industrial, TNT has been used in conjunction with hydraulic fracturing, a process used to recover oil and gas from shale formations. The technique involves displacing and detonating nitroglycerin in hydraulically induced fractures followed by wellbore shots using pelletized TNT, TNT is valued partly because of its insensitivity to shock and friction, with reduced risk of accidental detonation compared to more sensitive explosives such as nitroglycerin
30.
Dynamite
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Dynamite is an explosive made of nitroglycerin, sorbents and stabilizers. It was invented by the Swedish chemist and engineer Alfred Nobel in Geesthacht and it rapidly gained wide-scale use as a safer alternative to gun powder and nitroglycerin. Dynamite was invented by Alfred Nobel and was the first safely manageable explosive stronger than black powder, Nobel obtained patents for his invention in England on 7 May 1867, in Sweden on 19 October 1867. After its introduction, dynamite rapidly gained wide-scale use as an alternative to black powder. Nobel tightly controlled the patents, and unlicensed duplicating companies were shut down. However, a few American businessmen got around the patent by using a different formula. Nobel originally sold dynamite as Nobels Blasting Powder but decided to change the name to dynamite, from the Ancient Greek word δύναμις dýnamis, an industrialist, engineer, and inventor, Alfred Nobels father, Immanuel Nobel, built bridges and buildings in Stockholm. His construction work inspired him to new methods of blasting rock. Immanuels work with later on inspired Alfred to make explosives safer. Today dynamite is used in the mining, quarrying, construction. Dynamite is still the product of choice for trenching applications, Dynamite is occasionally used as an initiator or booster for AN and ANFO explosive charges. Nitroglycerin by itself is a strong explosive, but is extremely shock-sensitive, and degrades over time to even more unstable forms. Dynamite combines nitroglycerin with absorbents and stabilizers, rendering it safe to use, the original composition of dynamite consisted of three parts Explosive Oil, one part diatomaceous earth as the absorbent, and a small admixture of sodium carbonate antacid as the stabilizer. Diatomaceous earth is not usually used today as an absorbent medium and it has replaced by cheaper media like sawdust, wood pulp, flour. Other stabilizers like calcium carbonate or zinc oxide can be used in the place of sodium carbonate, sodium nitrate is added to the medium as an oxidizer that improves the dynamites brisance. Dynamite is usually sold in the form of cardboard cylinders about 20 cm long and about 3.2 cm in diameter, a stick of dynamite thus produced contains roughly 1 MJ of energy. Other sizes also exist, rated by either portion or by weight, Dynamite is usually rated by weight strength, usually from 20% to 60%. For example, 40% dynamite is composed of 40% nitroglycerin and 60% dope, the maximum shelf life of nitroglycerin-based dynamite is recommended as one year from the date of manufacture under good storage conditions
31.
United States Department of Transportation
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The United States Department of Transportation is a federal Cabinet department of the U. S. government concerned with transportation. It was established by an act of Congress on October 15,1966 and it is governed by the United States Secretary of Transportation. Prior to the Department of Transportation, the Under Secretary of Commerce for Transportation administered the functions now associated with the DOT, the awardees include light rail projects. Other projects include both a rail extension and a subway project in New York City, and a bus rapid transit system in Springfield. The budget provided funding for all of the projects currently receiving Recovery Act funding. It also continued funding for another 18 transit projects that are currently under construction or soon will be. Following the same the Consolidated Appropriations Act of 2014 delegates $600 million for Infrastructure Investments, the Department of Transportation was authorized a budget for Fiscal Year 2016 of $75.1 billion. e. Did not earn an overall grade
32.
ANFO
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ANFO is a widely used bulk industrial explosive. It consists of 94% porous prilled ammonium nitrate, which acts as the agent and absorbent for the fuel. ANFO is also used in avalanche hazard mitigation. It accounts for an estimated 80% of the 2. 7×109 kg of explosives used annually in North America, the press and other media have used the term ANFO loosely and imprecisely in describing IEDs, in cases of fertilizer bombs. The use of ANFO originated in the 1950s, the chemistry of ANFO detonation is the reaction of ammonium nitrate with a long-chain alkane to form nitrogen, carbon dioxide, and water. In an ideal stoichiometrically balanced reaction, ANFO is composed of about 94. 3% AN and 5. 7% FO by weight, in practice, a slight excess of fuel oil is added, as underdosing results in reduced performance while overdosing merely results in more post-blast fumes. When detonation conditions are optimal, the gases are the only products. In practical use, such conditions are impossible to attain, and blasts produce moderate amounts of gases such as carbon monoxide. The fuel component of ANFO is typically diesel, but kerosene, coal dust, racing fuel, finely powdered aluminium in the mixture will sensitise it to detonate more readily. ANFO is classified as an explosive, meaning that it decomposes through detonation rather than deflagration at a velocity higher than the speed of sound in the material. ANFO has a moderate velocity compared to other explosives, measuring 3,200 m/s in 130 mm diameter, unconfined. ANFO is an explosive, meaning that it cannot be set off by the small quantity of primary explosive in a typical blasting cap. A larger quantity of explosive, known as a primer or a booster. One or two sticks of dynamite were used, current practice is to use Tovex or cast boosters of pentolite. In the mining industry, the term ANFO specifically describes a mixture of ammonium nitrate prills. Other explosives based on the ANFO chemistry exist, the most commonly used are emulsions and they differ from ANFO in the physical form the reactants take. The most notable properties of emulsions are water resistance and higher bulk density, while the density of pure crystalline ammonium nitrate is 1700 kg/m3, individual prills of explosive-grade AN measure approximately 1300 kg/m3. Their lower density is due to the presence of a spherical air pocket within each prill
33.
Fireworks
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Fireworks are a class of low explosive pyrotechnic devices used for aesthetic and entertainment purposes. The most common use of a firework is as part of a fireworks display, Fireworks competitions are also regularly held at a number of places. Fireworks take many forms to produce the four primary effects, noise, light, smoke and they may be designed to burn with colored flames and sparks including red, orange, yellow, green, blue, purple, and silver. Displays are common throughout the world and are the point of many cultural. Fireworks were invented in ancient China in the 7th century to scare evil spirits. Such important events and festivities as Chinese New Year and the Mid-Autumn Moon Festival were, China is the largest manufacturer and exporter of fireworks in the world. Fireworks are generally classified as to where they perform, either as a ground or aerial firework, in the latter case they may provide their own propulsion or be shot into the air by a mortar. The most common feature of fireworks is a paper or pasteboard tube or casing filled with the combustible material, a number of these tubes or cases are often combined so as to make, when kindled, a great variety of sparkling shapes, often variously colored. The skyrocket is a form of firework, although the first skyrockets were used in war. The aerial shell, however, is the backbone of todays commercial aerial display, such rocket technology has also been used for the delivery of mail by rocket and is used as propulsion for most model rockets. The earliest documentation of fireworks dates back to 7th century China, the fireworks were used to accompany many festivities. It is thus a part of the culture of China and had its origin there, the art and science of firework making has developed into an independent profession. In China, pyrotechnicians were respected for their knowledge of techniques in mounting firework displays. Chinese people originally believed that the fireworks could expel evil spirits and bring about luck, during the Song Dynasty, many of the common people could purchase various kinds of fireworks from market vendors, and grand displays of fireworks were also known to be held. In 1110, a fireworks display in a martial demonstration was held to entertain Emperor Huizong of Song. A record from 1264 states that a rocket-propelled firework went off near the Empress Dowager Gong Sheng, rocket propulsion was common in warfare, as evidenced by the Huolongjing compiled by Liu Bowen and Jiao Yu. In 1240 the Arabs acquired knowledge of gunpowder and its uses from China, with the development of chinoiserie in Europe, Chinese fireworks began to gain popularity around the mid-17th century. Lev Izmailov, ambassador of Peter the Great, once reported from China and his writings would be translated in 1765, resulting in the popularization of fireworks and further attempts to uncover the secrets of Chinese fireworks
34.
Acetylene
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Acetylene is the chemical compound with the formula C2H2. It is a hydrocarbon and the simplest alkyne and this colorless gas is widely used as a fuel and a chemical building block. It is unstable in its form and thus is usually handled as a solution. Pure acetylene is odorless, but commercial grades usually have a marked odor due to impurities, as an alkyne, acetylene is unsaturated because its two carbon atoms are bonded together in a triple bond. The carbon–carbon triple bond places all four atoms in the straight line. Acetylene was discovered in 1836 by Edmund Davy, who identified it as a new carburet of hydrogen and it was rediscovered in 1860 by French chemist Marcellin Berthelot, who coined the name acétylène. Berthelots empirical formula for acetylene, as well as the alternative name quadricarbure dhydrogène were incorrect because chemists at that used the wrong atomic mass for carbon. Berthelot was able to prepare this gas by passing vapours of organic compounds through a red-hot tube and he also found acetylene was formed by sparking electricity through mixed cyanogen and hydrogen gases. Berthelot later obtained acetylene directly by passing hydrogen between the poles of a carbon arc, commercially available acetylene gas could smell foul due to the common impurities hydrogen sulfide and phosphine. However, as purity increases it will become odourless, since the 1950s, acetylene has mainly been manufactured by the partial combustion of methane or appears as a side product in the ethylene stream from cracking of hydrocarbons. Approximately 400,000 tonnes were produced by method in 1983. Its presence in ethylene is usually undesirable because of its explosive character and it is selectively hydrogenated into ethylene, usually using Pd–Ag catalysts. Until the 1950s, when oil supplanted coal as the source of reduced carbon. In the US, this process was an important part of the late-19th century revolution in chemistry enabled by the hydroelectric power project at Niagara Falls. In terms of valence bond theory, in each carbon atom the 2s orbital hybridizes with one 2p orbital thus forming an sp hybrid, the other two 2p orbitals remain unhybridized. The two ends of the two sp hybrid orbital overlap to form a strong σ valence bond between the carbons, while on each of the two ends hydrogen atoms attach also by σ bonds. The two unchanged 2p orbitals form a pair of weaker π bonds, since acetylene is a linear symmetrical molecule, it possesses the D∞h point group. At atmospheric pressure, acetylene cannot exist as a liquid and does not have a melting point, the triple point on the phase diagram corresponds to the melting point at the minimum pressure at which liquid acetylene can exist
35.
Hydrogen
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Hydrogen is a chemical element with chemical symbol H and atomic number 1. With a standard weight of circa 1.008, hydrogen is the lightest element on the periodic table. Its monatomic form is the most abundant chemical substance in the Universe, non-remnant stars are mainly composed of hydrogen in the plasma state. The most common isotope of hydrogen, termed protium, has one proton, the universal emergence of atomic hydrogen first occurred during the recombination epoch. At standard temperature and pressure, hydrogen is a colorless, odorless, tasteless, non-toxic, nonmetallic, since hydrogen readily forms covalent compounds with most nonmetallic elements, most of the hydrogen on Earth exists in molecular forms such as water or organic compounds. Hydrogen plays an important role in acid–base reactions because most acid-base reactions involve the exchange of protons between soluble molecules. In ionic compounds, hydrogen can take the form of a charge when it is known as a hydride. The hydrogen cation is written as though composed of a bare proton, Hydrogen gas was first artificially produced in the early 16th century by the reaction of acids on metals. Industrial production is mainly from steam reforming natural gas, and less often from more energy-intensive methods such as the electrolysis of water. Most hydrogen is used near the site of its production, the two largest uses being fossil fuel processing and ammonia production, mostly for the fertilizer market, Hydrogen is a concern in metallurgy as it can embrittle many metals, complicating the design of pipelines and storage tanks. Hydrogen gas is flammable and will burn in air at a very wide range of concentrations between 4% and 75% by volume. The enthalpy of combustion is −286 kJ/mol,2 H2 + O2 →2 H2O +572 kJ Hydrogen gas forms explosive mixtures with air in concentrations from 4–74%, the explosive reactions may be triggered by spark, heat, or sunlight. The hydrogen autoignition temperature, the temperature of spontaneous ignition in air, is 500 °C, the detection of a burning hydrogen leak may require a flame detector, such leaks can be very dangerous. Hydrogen flames in other conditions are blue, resembling blue natural gas flames, the destruction of the Hindenburg airship was a notorious example of hydrogen combustion and the cause is still debated. The visible orange flames in that incident were the result of a mixture of hydrogen to oxygen combined with carbon compounds from the airship skin. H2 reacts with every oxidizing element, the ground state energy level of the electron in a hydrogen atom is −13.6 eV, which is equivalent to an ultraviolet photon of roughly 91 nm wavelength. The energy levels of hydrogen can be calculated fairly accurately using the Bohr model of the atom, however, the atomic electron and proton are held together by electromagnetic force, while planets and celestial objects are held by gravity. The most complicated treatments allow for the effects of special relativity
36.
Propane
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Propane is a three-carbon alkane with the molecular formula C3H8, a gas, at standard temperature and pressure, but compressible to a transportable liquid. A by-product of natural gas processing and petroleum refining, it is used as a fuel for engines, oxy-gas torches, portable stoves. Propane is one of a group of liquefied petroleum gases, the others include butane, propylene, butadiene, butylene, isobutylene, and mixtures thereof. Propane was first identified as a component in gasoline by Walter O. Snelling of the U. S. Bureau of Mines in 1910. The volatility of these lighter hydrocarbons caused them to be known as wild because of the vapor pressures of unrefined gasoline. On March 31, the New York Times reported on Snellings work with liquefied gas and that a steel bottle will carry enough gas to light an ordinary home for three weeks. It was during this time that Snelling, in cooperation with Frank P. Peterson, Chester Kerr, together, they established American Gasol Co. the first commercial marketer of propane. Snelling had produced relatively pure propane by 1911, and on March 25,1913, a separate method of producing LP gas through compression was created by Frank Peterson and its patent granted on July 2,1912. The 1920s saw increased production of LP gas, with the first year of recorded production totaling 223,000 US gallons in 1922. In 1927, annual marketed LP gas production reached 1 million US gallons, and by 1935, major industry developments in the 1930s included the introduction of railroad tank car transport, gas odorization, and the construction of local bottle-filling plants. The year 1945 marked the first year that annual LP gas sales reached a billion gallons, by 1947, 62% of all U. S. homes had been equipped with either natural gas or propane for cooking. In 1950,1,000 propane-fueled buses were ordered by the Chicago Transit Authority, in 2004 it was reported to be a growing $8-billion to $10-billion industry with over 15 billion US gallons of propane being used annually in the U. S. The prop- root found in propane and names of compounds with three-carbon chains was derived from propionic acid. Propane is produced as a by-product of two processes, natural gas processing and petroleum refining. The processing of natural gas involves removal of butane, propane, additionally, oil refineries produce some propane as a by-product of cracking petroleum into gasoline or heating oil. The supply of propane cannot easily be adjusted to meet increased demand, about 90% of U. S. propane is domestically produced. The United States imports about 10% of the propane consumed each year, with about 70% of that coming from Canada via pipeline, the remaining 30% of imported propane comes to the United States from other sources via ocean transport. After it is produced, North American propane is stored in salt caverns
37.
Nitrogen
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Nitrogen is a chemical element with symbol N and atomic number 7. It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772, although Carl Wilhelm Scheele and Henry Cavendish had independently done so at about the same time, Rutherford is generally accorded the credit because his work was published first. Nitrogen is the lightest member of group 15 of the periodic table, the name comes from the Greek πνίγειν to choke, directly referencing nitrogens asphyxiating properties. It is an element in the universe, estimated at about seventh in total abundance in the Milky Way. At standard temperature and pressure, two atoms of the element bind to form dinitrogen, a colourless and odorless diatomic gas with the formula N2, dinitrogen forms about 78% of Earths atmosphere, making it the most abundant uncombined element. Nitrogen occurs in all organisms, primarily in amino acids, in the nucleic acids, the human body contains about 3% nitrogen by mass, the fourth most abundant element in the body after oxygen, carbon, and hydrogen. The nitrogen cycle describes movement of the element from the air, into the biosphere and organic compounds, many industrially important compounds, such as ammonia, nitric acid, organic nitrates, and cyanides, contain nitrogen. The extremely strong bond in elemental nitrogen, the second strongest bond in any diatomic molecule. Synthetically produced ammonia and nitrates are key industrial fertilisers, and fertiliser nitrates are key pollutants in the eutrophication of water systems. Apart from its use in fertilisers and energy-stores, nitrogen is a constituent of organic compounds as diverse as Kevlar used in high-strength fabric, Nitrogen is a constituent of every major pharmacological drug class, including antibiotics. Many notable nitrogen-containing drugs, such as the caffeine and morphine or the synthetic amphetamines. Nitrogen compounds have a long history, ammonium chloride having been known to Herodotus. They were well known by the Middle Ages, alchemists knew nitric acid as aqua fortis, as well as other nitrogen compounds such as ammonium salts and nitrate salts. The mixture of nitric and hydrochloric acids was known as aqua regia, celebrated for its ability to dissolve gold, the discovery of nitrogen is attributed to the Scottish physician Daniel Rutherford in 1772, who called it noxious air. Though he did not recognise it as a different chemical substance, he clearly distinguished it from Joseph Blacks fixed air. The fact that there was a component of air that does not support combustion was clear to Rutherford, Nitrogen was also studied at about the same time by Carl Wilhelm Scheele, Henry Cavendish, and Joseph Priestley, who referred to it as burnt air or phlogisticated air. Nitrogen gas was inert enough that Antoine Lavoisier referred to it as air or azote, from the Greek word άζωτικός. In an atmosphere of nitrogen, animals died and flames were extinguished
38.
Neon
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Neon is a chemical element with symbol Ne and atomic number 10 and is a noble gas. Neon is a colorless, odorless, inert gas under standard conditions. It was discovered in 1898 as one of the three residual rare inert elements remaining in dry air, after nitrogen, oxygen, argon and carbon dioxide were removed. Neon was the second of three rare gases to be discovered, and was immediately recognized as a new element from its bright red emission spectrum. The name neon is derived from the Greek word, νέον, neuter singular form of νέος, Neon is chemically inert and forms no uncharged chemical compounds. The compounds of neon include ionic molecules, molecules held together by van der Waals forces and clathrates, during cosmic nucleogenesis of the elements, large amounts of neon are built up from the alpha-capture fusion process in stars. Although neon is a common element in the universe and solar system. It composes about 18.2 ppm of air by volume, the reason for neons relative scarcity on Earth and the inner planets is that neon is highly volatile and forms no compounds to fix it to solids. As a result, it escaped from the planetesimals under the warmth of the newly ignited Sun in the early Solar System, even the atmosphere of Jupiter is somewhat depleted of neon, presumably for this reason. It is also lighter than air, causing it to escape even from Earths atmosphere, Neon gives a distinct reddish-orange glow when used in low-voltage neon glow lamps, high-voltage discharge tubes and neon advertising signs. The red emission line from neon also causes the well known red light of helium–neon lasers, Neon is used in some plasma tube and refrigerant applications but has few other commercial uses. It is commercially extracted by the distillation of liquid air. Since air is the source, it is considerably more expensive than helium. Neon, was discovered in 1898 by the British chemists Sir William Ramsay, Neon was discovered when Ramsay chilled a sample of air until it became a liquid, then warmed the liquid and captured the gases as they boiled off. The gases nitrogen, oxygen, and argon had been identified, first to be identified was krypton. The next, after krypton had been removed, was a gas which gave a brilliant red light under spectroscopic discharge and this gas, identified in June, was named neon, the Greek analogue of novum, suggested by Ramsays son. A second gas was reported along with neon, having approximately the same density as argon but with a different spectrum – Ramsay. However, subsequent spectroscopic analysis revealed it to be contaminated with carbon monoxide
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