1.
Personal protective equipment
–
Personal protective equipment refers to protective clothing, helmets, goggles, or other garments or equipment designed to protect the wearers body from injury or infection. The hazards addressed by protective equipment include physical, electrical, heat, chemicals, biohazards, Protective equipment may be worn for job-related occupational safety and health purposes, as well as for sports and other recreational activities. Protective clothing is applied to categories of clothing, and protective gear applies to items such as pads, guards, shields, or masks. PPE is needed there are hazards present. PPE has the limitation that it does not eliminate the hazard at source. Any item of PPE imposes a barrier between the wearer/user and the working environment and this can create additional strains on the wearer, impair their ability to carry out their work and create significant levels of discomfort. Any of these can discourage wearers from using PPE correctly, therefore placing them at risk of injury, ill-health or, under extreme circumstances, death. Good ergonomic design can help to minimise these barriers and can help to ensure safe. Practices of occupational safety and health can use hazard controls and interventions to mitigate workplace hazards, the hierarchy of hazard controls provides a policy framework which ranks the types of hazard controls in terms of absolute risk reduction. At the top of the hierarchy are elimination and substitution, which remove the hazard entirely or replace the hazard with a safer alternative. If elimination or substitution measures cannot apply, engineering controls and administrative controls, Personal protective equipment ranks last on the hierarchy of controls, as the workers are regularly exposed to the hazard, with a barrier of protection. The hierarchy of controls is important in acknowledging that, while personal protective equipment has tremendous utility, Personal protective equipment can be categorized by the area of the body protected, by the types of hazard, and by the type of garment or accessory. The protective attributes of each piece of equipment must be compared with the expected to be found in the workplace. More breathable types of protective equipment may not lead to more contamination. Respirators serve to protect the user from breathing in contaminants in the air, there are two main types of respirators. One type functions by filtering out chemicals and gases, or airborne particles, the filtration may be either passive or active. Gas masks and particulate respirators are examples of type of respirator. A second type protects users by providing clean, respirable air from another source and this type includes airline respirators and self-contained breathing apparatus
2.
Particles
–
A particle is a minute fragment or quantity of matter. In the physical sciences, a particle is a small localized object to which can be ascribed several physical or chemical properties such as volume or mass. Particles can also be used to create models of even larger objects depending on their density. The term particle is rather general in meaning, and is refined as needed by various scientific fields, something that is composed of particles may be referred to as being particulate. However, the particulate is most frequently used to refer to pollutants in the Earths atmosphere. The concept of particles is particularly useful when modelling nature, as the treatment of many phenomena can be complex. It can be used to make simplifying assumptions concerning the processes involved, francis Sears and Mark Zemansky, in University Physics, give the example of calculating the landing location and speed of a baseball thrown in the air. The treatment of large numbers of particles is the realm of statistical physics, the term particle is usually applied differently to three classes of sizes. The term macroscopic particle, usually refers to particles much larger than atoms and these are usually abstracted as point-like particles, or even invisible. This is even though they have volumes, shapes, structures, examples of macroscopic particles would include powder, dust, sand, pieces of debris during a car accident, or even objects as big as the stars of a galaxy. Another type, microscopic particles usually refers to particles of sizes ranging from atoms to molecules, such as carbon dioxide, nanoparticles and these particles are studied in chemistry, as well as atomic and molecular physics. The smallest of particles are the particles, which refer to particles smaller than atoms. These particles are studied in particle physics, because of their extremely small size, the study of microscopic and subatomic particles fall in the realm of quantum mechanics. Particles can also be classified according to composition, composite particles refer to particles that have composition – that is particles which are made of other particles. For example, an atom is made of six protons, eight neutrons. By contrast, elementary particles refer to particles that are not made of other particles, according to our current understanding of the world, only a very small number of these exist, such as the leptons, quarks or gluons. However it is possible some of these might turn up to be composite particles after all. While composite particles can very often be considered point-like, elementary particles are truly punctual, both elementary and composite particles, are known to undergo particle decay
3.
Light
–
Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. The word usually refers to light, which is visible to the human eye and is responsible for the sense of sight. Visible light is defined as having wavelengths in the range of 400–700 nanometres, or 4.00 × 10−7 to 7.00 × 10−7 m. This wavelength means a range of roughly 430–750 terahertz. The main source of light on Earth is the Sun, sunlight provides the energy that green plants use to create sugars mostly in the form of starches, which release energy into the living things that digest them. This process of photosynthesis provides virtually all the used by living things. Historically, another important source of light for humans has been fire, with the development of electric lights and power systems, electric lighting has effectively replaced firelight. Some species of animals generate their own light, a process called bioluminescence, for example, fireflies use light to locate mates, and vampire squids use it to hide themselves from prey. Visible light, as all types of electromagnetic radiation, is experimentally found to always move at this speed in a vacuum. In physics, the term sometimes refers to electromagnetic radiation of any wavelength. In this sense, gamma rays, X-rays, microwaves and radio waves are also light, like all types of light, visible light is emitted and absorbed in tiny packets called photons and exhibits properties of both waves and particles. This property is referred to as the wave–particle duality, the study of light, known as optics, is an important research area in modern physics. Generally, EM radiation, or EMR, is classified by wavelength into radio, microwave, infrared, the behavior of EMR depends on its wavelength. Higher frequencies have shorter wavelengths, and lower frequencies have longer wavelengths, when EMR interacts with single atoms and molecules, its behavior depends on the amount of energy per quantum it carries. There exist animals that are sensitive to various types of infrared, infrared sensing in snakes depends on a kind of natural thermal imaging, in which tiny packets of cellular water are raised in temperature by the infrared radiation. EMR in this range causes molecular vibration and heating effects, which is how these animals detect it, above the range of visible light, ultraviolet light becomes invisible to humans, mostly because it is absorbed by the cornea below 360 nanometers and the internal lens below 400. Furthermore, the rods and cones located in the retina of the eye cannot detect the very short ultraviolet wavelengths and are in fact damaged by ultraviolet. Many animals with eyes that do not require lenses are able to detect ultraviolet, by quantum photon-absorption mechanisms, various sources define visible light as narrowly as 420 to 680 to as broadly as 380 to 800 nm
4.
Wind
–
Wind is the flow of gases on a large scale. On the surface of the Earth, wind consists of the movement of air. Winds are commonly classified by their scale, their speed, the types of forces that cause them, the regions in which they occur. The strongest observed winds on a planet in the Solar System occur on Neptune, Winds have various aspects, an important one being its velocity, another the density of the gas involved, another its energy content or wind energy. In meteorology, winds are referred to according to their strength. Short bursts of high speed wind are termed gusts, strong winds of intermediate duration are termed squalls. Long-duration winds have various names associated with their strength, such as breeze, gale, storm. The two main causes of large-scale atmospheric circulation are the differential heating between the equator and the poles, and the rotation of the planet, within the tropics, thermal low circulations over terrain and high plateaus can drive monsoon circulations. In coastal areas the sea breeze/land breeze cycle can define local winds, in areas that have variable terrain, mountain, Wind powers the voyages of sailing ships across Earths oceans. Hot air balloons use the wind to take trips, and powered flight uses it to increase lift. Areas of wind caused by various weather phenomena can lead to dangerous situations for aircraft. When winds become strong, trees and man-made structures are damaged or destroyed, Winds can shape landforms, via a variety of aeolian processes such as the formation of fertile soils, such as loess, and by erosion. Wind also affects the spread of wildfires, Winds can disperse seeds from various plants, enabling the survival and dispersal of those plant species, as well as flying insect populations. When combined with temperatures, wind has a negative impact on livestock. Wind affects animals food stores, as well as their hunting, Wind is caused by differences in the atmospheric pressure. When a difference in atmospheric pressure exists, air moves from the higher to the pressure area. On a rotating planet, air will also be deflected by the Coriolis effect, globally, the two major driving factors of large-scale wind patterns are the differential heating between the equator and the poles and the rotation of the planet. Outside the tropics and aloft from frictional effects of the surface, near the Earths surface, friction causes the wind to be slower than it would be otherwise
5.
Heat
–
In physics, heat is the amount of energy flowing from one body to another spontaneously due to their temperature difference, or by any means other than through work or the transfer of matter. Thus, energy exchanged as heat during a process changes the energy of each body by equal. The sign of the quantity of heat can indicate the direction of the transfer, for example from system A to system B, negation indicates energy flowing in the opposite direction. While heat flows spontaneously from hot to cold, it is possible to construct a heat pump or refrigeration system that does work to increase the difference in temperature between two systems, conversely, a heat engine reduces an existing temperature difference to do work on another system. Heat is a consequence of the motion of particles. When heat is transferred between two objects or systems, the energy of the object or systems particles increases, as this occurs, the arrangement between particles becomes more and more disordered. In other words, heat is related to the concept of entropy, historically, many energy units for measurement of heat have been used. The standards-based unit in the International System of Units is the joule, Heat is measured by its effect on the states of interacting bodies, for example, by the amount of ice melted or a change in temperature. The quantification of heat via the change of a body is called calorimetry. In calorimetry, sensible heat is defined with respect to a specific chosen state variable of the system, sensible heat causes a change of the temperature of the system while leaving the chosen state variable unchanged. Heat transfer that occurs at a constant system temperature but changes the state variable is called latent heat with respect to the variable, for infinitesimal changes, the total incremental heat transfer is then the sum of the latent and sensible heat. Physicist James Clerk Maxwell, in his 1871 classic Theory of Heat, was one of many who began to build on the established idea that heat has something to do with matter in motion. This was the idea put forth by Benjamin Thompson in 1798. One of Maxwells recommended books was Heat as a Mode of Motion, Maxwell outlined four stipulations for the definition of heat, It is something which may be transferred from one body to another, according to the second law of thermodynamics. It is a quantity, and so can be treated mathematically. It cannot be treated as a substance, because it may be transformed into something that is not a material substance. Heat is one of the forms of energy and this was the way of the historical pioneers of thermodynamics. Maxwell writes that convection as such is not a purely thermal phenomenon, in thermodynamics, convection in general is regarded as transport of internal energy
6.
Sea spray
–
Sea spray refers to aerosol particles that are formed directly from the ocean, mostly by ejection into the atmosphere by bursting bubbles at the air-sea interface. Sea salt aerosol contains both inorganic salts and organic matter from the ocean and it is thought that the amount of organic matter transferred to SSA depends on microbiological activity. The organic matter in sea spray can contain dissolved organic matter or even themselves, like bacteria. Salt spray is largely responsible for corrosion of metallic objects near the coastline, as the salts accelerate the process in the presence of abundant atmospheric oxygen. Salts do not dissolve in air directly, but are suspended as fine particulates, the salt spray test is the notable measure of material endurance, particularly if the material will be used outdoors and must perform in a mechanical load bearing or otherwise critical role. These results are often of great interest to the industries, whose products may suffer extreme acceleration of corrosion
7.
Ball
–
A ball is a round object with various uses. It is used in games, where the play of the game follows the state of the ball as it is hit. Balls can also be used for activities, such as catch, marbles. Balls made from hard-wearing materials are used in engineering applications to very low friction bearings. Black-powder weapons use stone and metal balls as projectiles, although many types of balls are today made from rubber, this form was unknown outside the Americas until after the voyages of Columbus. The Spanish were the first Europeans to see bouncing rubber balls which were employed most notably in the Mesoamerican ballgame, balls used in various sports in other parts of the world prior to Columbus were made from other materials such as animal bladders or skins, stuffed with various materials. As balls are one of the most familiar spherical objects to humans, no Old English representative of any of these is known. If ball- was native in Germanic, it may have been a cognate with the Latin foll-is in sense of a blown up or inflated. In the later Middle English spelling balle the word coincided graphically with the French balle ball, French balle is assumed to be of Germanic origin, itself, however. In Ancient Greek the word πάλλα for ball is attested besides the word σφαίρα, a ball, as the essential feature in many forms of gameplay requiring physical exertion, must date from the very earliest times. A rolling object appeals not only to a baby but to a kitten. Some form of game with a ball is found portrayed on Egyptian monuments, in Homer, Nausicaa was playing at ball with her maidens when Odysseus first saw her in the land of the Phaeacians. And Halios and Laodamas performed before Alcinous and Odysseus with ball play, of regular rules for the playing of ball games, little trace remains, if there were any such. Pollux mentions a game called episkyros, which has often been looked on as the origin of football and it seems to have been played by two sides, arranged in lines, how far there was any form of goal seems uncertain. Among the Romans, ball games were looked upon as an adjunct to the bath, and were graduated to the age and health of the bathers and this was struck from player to player, who wore a kind of gauntlet on the arm. These games are known to us through the Romans, though the names are Greek, the various modern games played with a ball or balls and subject to rules are treated under their various names, such as polo, cricket, football, etc. Several sports use a ball in the shape of a prolate spheroid, Ball Buckminster Fullerene Football Kickball Marbles Penny floater Prisoner Ball Shuttlecock Super Ball
8.
Hockey puck
–
A hockey puck is a disk made of vulcanized rubber that serves the same functions in various games as a ball does in ball games. The best-known use of pucks is in ice hockey, an international sport. Many tribes throughout North America played a version of hockey which involved some type of puck or ball. Ice hockey was first observed by Europeans being played by Mikmaq Indians in Nova Scotia in the late 17th century and it was called ricket by the Natives. The game was played utilizing a frozen road apple as the first puck, eventually, they began to carve pucks from cherrywood, which was the puck of preference until late in the century when rubber imported by Euro-Americans replaced the wood. The origin of the puck is obscure. The first known printed reference was in Montreal, Quebec in 1876, a hockey puck is also referred to colloquially as a biscuit. To put the biscuit in the basket is to score a goal, Ice hockey requires a hard disk of vulcanized rubber. A standard ice hockey puck is black,1 inch thick,3 inches in diameter, pucks are often marked with silkscreened team or league logos on one or both faces. Pucks are frozen before the game to reduce bouncing during play, Ice hockey and its various precursor games utilized balls until the late 19th century. By the 1870s, flat pucks were made of wood as well as rubber, the first recorded organized game of ice hockey used a wooden puck to prevent it from leaving the rink of play. The rubber pucks were first made by slicing a rubber ball, the Victoria Hockey Club of Montreal is credited with making and using the first round pucks in the 1880s. There are several variations on the black,6 ounces hockey puck. One of the most common is a blue,4 ounces puck that is used for training younger players who are not yet able to use a standard puck. Players looking to increase wrist strength often practice with steel pucks that weigh 2 pounds, white pucks can be used for goalie training. These are regulation size and weight, but made from white rubber, a hollow, light-weight fluorescent orange puck is available for road or floor hockey. Other variants, some with plastic ball bearings or glides, are available for use for road or roller hockey, the FoxTrax smart puck was developed by the Fox television network when it held NHL broadcasting rights for the U. S. The puck had integrated electronics to track its position on screen, the streak would turn red if the puck was shot especially hard
9.
Goggles
–
Goggles or safety glasses are forms of protective eyewear that usually enclose or protect the area surrounding the eye in order to prevent particulates, water or chemicals from striking the eyes. They are used in laboratories and in woodworking. They are often used in sports as well, and in swimming. Goggles are often worn when using tools such as drills or chainsaws to prevent flying particles from damaging the eyes. Many types of goggles are available as prescription goggles for those with vision problems, the Inuit and Yupik people carved Inuit snow goggles from caribou antler, wood, and shell to help prevent snow blindness. The goggles were curved to fit the users face and had a groove cut in the back to allow for the nose. A long thin slit was cut through the goggles to allow in an amount of light. The goggles were held to the head by a made of caribou sinew. In the early 20th century, goggles were worn by drivers of uncovered cars to prevent irritation of the eyes by dust or wind, the first pilot to wear goggles was probably Charles Manly in his failed attempt to fly Samuel Langleys aerodrome in 1903. The requirements for goggles varies depending on the use, some examples, Cold weather, Most modern cold-weather goggles have two layers of lens to prevent the interior from becoming foggy. With only a lens, the interior water vapor condenses onto the lens because the lens is colder than the vapor. The reasoning behind dual layer lens is that the lens will be warm while the outer lens will be cold. As long as the temperature of the lens is close to that of the interior water vapor. Swimming, Must be watertight to prevent water, such as water when swimming in the ocean, or chlorinated water when swimming in a pool. Allows swimmers to see clearly underwater and they will not be usable more than a few feet underwater, because the water pressure will press them tightly against the face. Examples of these include the Swedish goggles, power tools, Must be made of an unbreakable material that prevents chunks of metal, wood, plastic, concrete, and so on from hitting or piercing the eye. Usually has some sort of ventilation to prevent sweat from building up inside the goggles, blowtorch goggles, These protect the eyes from glare and flying sparks and hot metal splashes while using or near a blowtorch. They are not the filters for arc welding
