1.
Metric system
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The metric system is an internationally agreed decimal system of measurement. Many sources also cite Liberia and Myanmar as the other countries not to have done so. Although the originators intended to devise a system that was accessible to all. Control of the units of measure was maintained by the French government until 1875, when it was passed to an intergovernmental organisation. From its beginning, the features of the metric system were the standard set of interrelated base units. These base units are used to larger and smaller units that could replace a huge number of other units of measure in existence. Although the system was first developed for use, the development of coherent units of measure made it particularly suitable for science. Although the metric system has changed and developed since its inception, designed for transnational use, it consisted of a basic set of units of measurement, now known as base units. At the outbreak of the French Revolution in 1789, most countries, the metric system was designed to be universal—in the words of the French philosopher Marquis de Condorcet it was to be for all people for all time. However, these overtures failed and the custody of the metric system remained in the hands of the French government until 1875. In languages where the distinction is made, unit names are common nouns, the concept of using consistent classical names for the prefixes was first proposed in a report by the Commission on Weights and Measures in May 1793. The prefix kilo, for example, is used to multiply the unit by 1000, thus the kilogram and kilometre are a thousand grams and metres respectively, and a milligram and millimetre are one thousandth of a gram and metre respectively. These relations can be written symbolically as,1 mg =0, however,1935 extensions to the prefix system did not follow this convention, the prefixes nano- and micro-, for example have Greek roots. During the 19th century the prefix myria-, derived from the Greek word μύριοι, was used as a multiplier for 10000, prefixes are not usually used to indicate multiples of a second greater than 1, the non-SI units of minute, hour and day are used instead. On the other hand, prefixes are used for multiples of the unit of volume. The base units used in the system must be realisable. Each of the units in SI is accompanied by a mise en pratique published by the BIPM that describes in detail at least one way in which the base unit can be measured. In practice, such realisation is done under the auspices of a mutual acceptance arrangement, in the original version of the metric system the base units could be derived from a specified length and the weight of a specified volume of pure water
2.
Metre
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The metre or meter, is the base unit of length in the International System of Units. The metre is defined as the length of the path travelled by light in a vacuum in 1/299792458 seconds, the metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole. In 1799, it was redefined in terms of a metre bar. In 1960, the metre was redefined in terms of a number of wavelengths of a certain emission line of krypton-86. In 1983, the current definition was adopted, the imperial inch is defined as 0.0254 metres. One metre is about 3 3⁄8 inches longer than a yard, Metre is the standard spelling of the metric unit for length in nearly all English-speaking nations except the United States and the Philippines, which use meter. Measuring devices are spelled -meter in all variants of English, the suffix -meter has the same Greek origin as the unit of length. This range of uses is found in Latin, French, English. Thus calls for measurement and moderation. In 1668 the English cleric and philosopher John Wilkins proposed in an essay a decimal-based unit of length, as a result of the French Revolution, the French Academy of Sciences charged a commission with determining a single scale for all measures. In 1668, Wilkins proposed using Christopher Wrens suggestion of defining the metre using a pendulum with a length which produced a half-period of one second, christiaan Huygens had observed that length to be 38 Rijnland inches or 39.26 English inches. This is the equivalent of what is now known to be 997 mm, no official action was taken regarding this suggestion. In the 18th century, there were two approaches to the definition of the unit of length. One favoured Wilkins approach, to define the metre in terms of the length of a pendulum which produced a half-period of one second. The other approach was to define the metre as one ten-millionth of the length of a quadrant along the Earths meridian, that is, the distance from the Equator to the North Pole. This means that the quadrant would have defined as exactly 10000000 metres at that time. To establish a universally accepted foundation for the definition of the metre, more measurements of this meridian were needed. This portion of the meridian, assumed to be the length as the Paris meridian, was to serve as the basis for the length of the half meridian connecting the North Pole with the Equator
3.
Imperial units
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The system of imperial units or the imperial system is the system of units first defined in the British Weights and Measures Act of 1824, which was later refined and reduced. The Imperial units replaced the Winchester Standards, which were in effect from 1588 to 1825, the system came into official use across the British Empire. The imperial system developed from what were first known as English units, the Weights and Measures Act of 1824 was initially scheduled to go into effect on 1 May 1825. However, the Weights and Measures Act of 1825 pushed back the date to 1 January 1826, the 1824 Act allowed the continued use of pre-imperial units provided that they were customary, widely known, and clearly marked with imperial equivalents. Apothecaries units are mentioned neither in the act of 1824 nor 1825, at the time, apothecaries weights and measures were regulated in England, Wales, and Berwick-upon-Tweed by the London College of Physicians, and in Ireland by the Dublin College of Physicians. In Scotland, apothecaries units were unofficially regulated by the Edinburgh College of Physicians, the three colleges published, at infrequent intervals, pharmacopoeiae, the London and Dublin editions having the force of law. The Medical Act of 1858 transferred to The Crown the right to publish the official pharmacopoeia and to regulate apothecaries weights, Metric equivalents in this article usually assume the latest official definition. Before this date, the most precise measurement of the imperial Standard Yard was 0.914398416 metres, in 1824, the various different gallons in use in the British Empire were replaced by the imperial gallon, a unit close in volume to the ale gallon. It was originally defined as the volume of 10 pounds of distilled water weighed in air with brass weights with the standing at 30 inches of mercury at a temperature of 62 °F. The Weights and Measures Act of 1985 switched to a gallon of exactly 4.54609 l and these measurements were in use from 1826, when the new imperial gallon was defined, but were officially abolished in the United Kingdom on 1 January 1971. In the USA, though no longer recommended, the system is still used occasionally in medicine. The troy pound was made the unit of mass by the 1824 Act, however, its use was abolished in the UK on 1 January 1879, with only the troy ounce. The Weights and Measures Act 1855 made the pound the primary unit of mass. In all the systems, the unit is the pound. For the yard, the length of a pendulum beating seconds at the latitude of Greenwich at Mean Sea Level in vacuo was defined as 39.01393 inches, the imperial system is one of many systems of English units. Although most of the units are defined in more than one system, some units were used to a much greater extent, or for different purposes. The distinctions between these systems are not drawn precisely. One such distinction is that between these systems and older British/English units/systems or newer additions, the US customary system is historically derived from the English units that were in use at the time of settlement
4.
Mile
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The mile is an English unit of length of linear measure equal to 5,280 feet, or 1,760 yards, and standardised as exactly 1,609.344 metres by international agreement in 1959. The Romans divided their mile into 5,000 feet but the importance of furlongs in pre-modern England meant that the statute mile was made equivalent to 8 furlongs or 5,280 feet in 1593. This form of the mile then spread to the British-colonized nations who continue to employ the mile, the US Geological Survey now employs the metre for official purposes but legacy data from its 1927 geodetic datum has meant that a separate US survey mile continues to see some use. Derived units such as miles per hour and miles per gallon, however, continue to be abbreviated as mph, mpg. The modern English word mile derives from Middle English myl and Old English mīl, the present international mile is usually what is understood by the unqualified term mile. When this distance needs to be distinguished from the nautical mile, in British English, the statute mile may refer to the present international miles or to any other form of English mile since the 1593 Act of Parliament which set it as a distance of 1,760 yards. Under American law, however, the statute mile refers to the US survey mile, the mile has been variously abbreviated—with and without a trailing period—as m, M, ml, and mi. The American National Institute of Standards and Technology now uses and recommends mi in order to avoid confusion with the SI metre and millilitre. Derived units such as miles per hour and miles per gallon, however, continue to be abbreviated in the United States, United Kingdom, the BBC style holds that There is no acceptable abbreviation for ‘miles’ and so it should be spelt out when used in describing areas. The Roman mile consisted of a thousand paces as measured by every other step—as in the distance of the left foot hitting the ground 1,000 times. The ancient Romans, marching their armies through uncharted territory, would push a carved stick in the ground after each 1000 paces. Well-fed and harshly driven Roman legionaries in good weather thus created longer miles, the distance was indirectly standardised by Agrippas establishment of a standard Roman foot in 29 BC, and the definition of a pace as 5 feet. An Imperial Roman mile thus denoted 5,000 Roman feet, surveyors and specialized equipment such as the decempeda and dioptra then spread its use. In modern times, Agrippas Imperial Roman mile was empirically estimated to have been about 1,481 metres in length, in Hellenic areas of the Empire, the Roman mile was used beside the native Greek units as equivalent to 8 stadia of 600 Greek feet. The mílion continued to be used as a Byzantine unit and was used as the name of the zero mile marker for the Byzantine Empire. The Roman mile also spread throughout Europe, with its local variations giving rise to the different units below, also arising from the Roman mile is the milestone. All roads radiated out from the Roman Forum throughout the Empire –50,000 miles of stone-paved roads, at every mile was placed a shaped stone, on which was carved a Roman numeral, indicating the number of miles from the center of Rome – the Forum. Hence, one knew how far one was from Rome
5.
Kilogram
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The kilogram or kilogramme is the base unit of mass in the International System of Units and is defined as being equal to the mass of the International Prototype of the Kilogram. The avoirdupois pound, used in both the imperial and US customary systems, is defined as exactly 0.45359237 kg, making one kilogram approximately equal to 2.2046 avoirdupois pounds. Other traditional units of weight and mass around the world are also defined in terms of the kilogram, the gram, 1/1000 of a kilogram, was provisionally defined in 1795 as the mass of one cubic centimeter of water at the melting point of ice. The final kilogram, manufactured as a prototype in 1799 and from which the IPK was derived in 1875, had an equal to the mass of 1 dm3 of water at its maximum density. The kilogram is the only SI base unit with an SI prefix as part of its name and it is also the only SI unit that is still directly defined by an artifact rather than a fundamental physical property that can be reproduced in different laboratories. Three other base units and 17 derived units in the SI system are defined relative to the kilogram, only 8 other units do not require the kilogram in their definition, temperature, time and frequency, length, and angle. At its 2011 meeting, the CGPM agreed in principle that the kilogram should be redefined in terms of the Planck constant, the decision was originally deferred until 2014, in 2014 it was deferred again until the next meeting. There are currently several different proposals for the redefinition, these are described in the Proposed Future Definitions section below, the International Prototype Kilogram is rarely used or handled. In the decree of 1795, the term gramme thus replaced gravet, the French spelling was adopted in the United Kingdom when the word was used for the first time in English in 1797, with the spelling kilogram being adopted in the United States. In the United Kingdom both spellings are used, with kilogram having become by far the more common, UK law regulating the units to be used when trading by weight or measure does not prevent the use of either spelling. In the 19th century the French word kilo, a shortening of kilogramme, was imported into the English language where it has used to mean both kilogram and kilometer. In 1935 this was adopted by the IEC as the Giorgi system, now known as MKS system. In 1948 the CGPM commissioned the CIPM to make recommendations for a practical system of units of measurement. This led to the launch of SI in 1960 and the subsequent publication of the SI Brochure, the kilogram is a unit of mass, a property which corresponds to the common perception of how heavy an object is. Mass is a property, that is, it is related to the tendency of an object at rest to remain at rest, or if in motion to remain in motion at a constant velocity. Accordingly, for astronauts in microgravity, no effort is required to hold objects off the cabin floor, they are weightless. However, since objects in microgravity still retain their mass and inertia, the ratio of the force of gravity on the two objects, measured by the scale, is equal to the ratio of their masses. On April 7,1795, the gram was decreed in France to be the weight of a volume of pure water equal to the cube of the hundredth part of the metre
6.
Gough Whitlam
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Edward Gough Whitlam AC QC was the 21st Prime Minister of Australia, serving from 1972 to 1975. The Leader of the Labor Party from 1967 to 1977, Whitlam led his party to power for the first time in 23 years at the 1972 election. He won the 1974 election before being dismissed by the Governor-General of Australia, Sir John Kerr. Whitlam remains the only Australian prime minister to have his commission terminated in that manner, Whitlam served in the Royal Australian Air Force during World War II for four years as airforce navigator in the Pacific and worked as a barrister following the war. He was first elected to Parliament in 1952, representing Werriwa in the House of Representatives, Whitlam became Deputy Leader of the Labor Party in 1960, and in 1967, after the retirement of Arthur Calwell, was elected Leader and became the Leader of the Opposition. After narrowly losing the 1969 election, Whitlam led Labor to victory at the 1972 election after 23 years of continuous Liberal-Country Coalition Government. The government and the opposition then had equal numbers in the Senate where they voted against the six trigger bills which had formed the basis for the 1974 double dissolution. The Whitlam government then instituted the first and only 1974 joint sitting enabled under s.57 of the Constitution as part of the dissolution process. All six of the bills were then passed at the Joint Sitting in August 1974. Whitlam refused to back down, arguing that his government, which held a majority in the House of Representatives, was being held to ransom by the Senate. The crisis ended on 11 November, when Whitlam arrived at a meeting with the Governor-General, Sir John Kerr. Kerr had agreed to the documents and the date for the half-Senate election—13 December—with Whitlam over the preceding days. Whitlam described it as the greatest shock I had ever experienced when Kerr instead dismissed him without warning and commissioned the opposition leader, Malcolm Fraser, as prime minister. Later that afternoon, the House of Representatives passed a motion of no confidence in Fraser, Kerr refused to see the Speaker of the House or receive the motion of the House of Representatives and prorogued parliament with Fraser still in office. Labor lost the subsequent election by a landslide, Whitlam stepped down after losing again at the 1977 election, and retired from parliament in 1978. Upon the election of the Hawke Government in 1983, he was appointed as Ambassador to UNESCO, a position he filled with distinction and he remained active into his nineties. The circumstances of his dismissal and the legacy of his government remain a part of Australian political discourse. Edward Gough Whitlam was born on 11 July 1916 at the family home Ngara,46 Rowland Street, Kew and he was the older of two children born to Martha and Fred Whitlam
7.
National Convention
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The National Convention was the third government of the French Revolution, following the two-year National Constituent Assembly and the one-year Legislative Assembly. Created after the insurrection of 10 August 1792, it was the first French government organized as a republic. The Convention sat as an assembly from 20 September 1792 to 26 October 1795. The National Convention was therefore the first French assembly elected by a suffrage without distinctions of class, although the Convention lasted until 1795, power was effectively stripped from the elected deputies and concentrated in the small Committee of Public Safety from April 1793. After the fall of Robespierre, the Convention lasted for year until a new constitution was written. The election took place from 2 to 6 September 1792 after the election of the colleges by primary assemblies on 26 August. Therefore, the increased suffrage had very little impact, the electorate returned the same sort of men that the active citizens had chosen in 1791. In the whole of France, only eleven primary assemblies wanted to retain the monarchy, of the electoral assemblies, all tacitly voted for a republic – though only Paris used the word. None of the deputies stood as a royalist for elections, out of the five million Frenchmen able to vote, only a million showed up at the polls. The Salle des Machines had galleries for the public who often influenced the debates with interruptions or applause, the members of the Convention came from all classes of society, but the most numerous were lawyers. 75 members had sat in the National Constituent Assembly,183 in the Legislative Assembly, the full number of deputies was 749, not counting 33 from the French colonies, of whom only some arrived in Paris in time. Besides these, however, the newly formed départements annexed to France from 1792 to 1795 were allowed to send deputations, according to its own ruling, the Convention elected its President every fortnight, and the outgoing President was eligible for re-election after the lapse of a fortnight. Ordinarily the sessions were held in the morning, but evening sessions also occurred frequently, sometimes in exceptional circumstances the Convention declared itself in permanent session and sat for several days without interruption. For both legislative and administrative the Convention used committees, with more or less widely extended and regulated by successive laws. The most famous of these included the Committee of Public Safety. The Convention held legislative and executive powers during the first years of the French First Republic and had three periods, Girondin, Montagnard or Jacobin, and Thermidorian. The abolition of the royalty is a matter you cannot put off till tomorrow, the first session was held on 20 September 1792. The following day, amidst profound silence, the proposition was put to the assembly, on the 22nd came the news of the Battle of Valmy
8.
Expressways of Beijing
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Beijing was first linked to outside areas by the Jingshi Expressway in the late 1980s and early 1990s. Now, nine expressways link Beijing, and future expressways are planned, when the Airport Expressway and the Jingjintang Expressway opened, Beijing was already been griped by expressway fever. Out in the far part of town lay an unpopular Jingha Expressway. It still is too far out of central Beijing to be recognised as an important express roadway, by the Peoples Republic of Chinas 50th anniversary, however, more expressways were being built in Beijing. The Badaling Expressway, Jingshen Expressway and the Jingkai Expressway were built, in 2001 the Jingcheng Expressway was built. The northeastern and southeastern parts are ready to accommodate two more expressways, in 2004, the municipal government made a plan public complete up to 890 km of expressways. By 2006, the 6th Ring Road would be completed, also in that year, a major batch of expressways would be completed. The expressways around Beijing total 15, of these,11 would radiate from central Beijing. In early January 2005, mainland authorities revealed a plan for seven national expressways originating from Beijing, amongst those included an expressway bound straight for Taiwan. Nine toll expressways link Beijing to its suburbs, outlying regions, the Badaling Expressway connects Beijing to the Badaling section of the Great Wall of China. It runs from Madian to Badaling and Yanqing for a total of nearly 70 kilometres, parts of the expressway run through hilly terrain. The entire expressway opened late 2009/early 2010, with a length of about 210 km. This expressway is part of the larger Daguang Expressway, the Airport Expressway to Beijing Capital International Airport runs for under 20 kilometres and is one of the most used expressways in Beijing. Beijing authorities are planning two more expressways to link to the airport, Route, Sanyuanqiao - Siyuan Bridge - Dashanzi - N. It has no numbered expressway exits and functions mainly as a city express route, Route, Dawang Bridge - E. 4th Ring Road - Gaobeidian - E. It is a short and rather old expressway, Route, Sifang Bridge - Wufang Bridge - Bailu Toll Gate - E. Due to heavy traffic, it can be congested at times. It continues as China National Highway 106, Route, Liuliqiao - Yuegezhuang - Xidaokou - W. However, tolls are networked with the 6th Ring Road
9.
Metrication in the United States
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Although all U. S. customary units have been redefined in terms of SI units, the United States does not commonly mandate the use of SI. Although the Constitution grants Congress the authority to determine standards of measure, in the early 19th century, the U. S. Coast and Geodetic Survey used meter and kilogram standards brought from France. The signing of international agreement concluded five years of meetings in which the metric system was reformulated. The Metre Convention established the International Bureau of Weights and Measures in Sèvres, France, the definitions of United States customary units, such as the foot and pound, have been based on metric units since then. The 1895 Constitution of Utah, in Article X, Section 11, originally mandated that and this section was repealed, effective July 1,1987. The General Conference on Weights and Measures is the body for the modern metric system. The General Conference on Weights and Measures approved a version of the metric system in 1960 named Le Système international dunités. On February 10,1964, the National Bureau of Standards issued a statement that it use the metric system. In 1968, Congress authorized the U. S, Metric Study, a three-year study of systems of measurement in the United States, with emphasis on the feasibility of metrication. The United States Department of Commerce conducted the study, a 45-member advisory panel consulted and took testimony from hundreds of consumers, business organizations, labor groups, manufacturers, and state and local officials. The final report of the concluded that the U. S. would eventually join the rest of the world in the use of the metric system of measurement. The study found that units were already implemented in many areas. Metric Study recommended that the United States implement a planned transition to the principal use of the metric system over a decade. Congress passed the Metric Conversion Act of 1975 to coordinate and plan the use of the metric system in the United States. Voluntary conversion was initiated, and the United States Metric Board was established for planning, coordination, the public education component led to public awareness of the metric system, but the public response included resistance, apathy, and sometimes ridicule. In 1981, the USMB reported to Congress that it lacked the clear Congressional mandate necessary to bring about national conversion, the ending of the USMB increased doubts that metrication would really be implemented. Public and private sector metrication slowed even while competitiveness between nations and demands of global marketplaces increased. S. economy, the ANMC became a separately incorporated organization in 1976. The ANMC was intended to facilitate U. S, the ANMC attempted to coordinate the metric planning of many industrial sectors, unlike the USMB, which only attempted to implement the policy set forth in the Metric Conversion Act of 1975
10.
Olympic Games
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The Olympic Games are considered the worlds foremost sports competition with more than 200 nations participating. The Olympic Games are held four years, with the Summer and Winter Games alternating by occurring every four years. Their creation was inspired by the ancient Olympic Games, which were held in Olympia, Greece, Baron Pierre de Coubertin founded the International Olympic Committee in 1894, leading to the first modern Games in Athens in 1896. The IOC is the body of the Olympic Movement, with the Olympic Charter defining its structure. The evolution of the Olympic Movement during the 20th and 21st centuries has resulted in changes to the Olympic Games. The IOC has had to adapt to a variety of economic, political, as a result, the Olympics has shifted away from pure amateurism, as envisioned by Coubertin, to allowing participation of professional athletes. The growing importance of mass media created the issue of corporate sponsorship, World wars led to the cancellation of the 1916,1940, and 1944 Games. Large boycotts during the Cold War limited participation in the 1980 and 1984 Games, the Olympic Movement consists of international sports federations, National Olympic Committees, and organising committees for each specific Olympic Games. As the decision-making body, the IOC is responsible for choosing the host city for each Games, the IOC also determines the Olympic programme, consisting of the sports to be contested at the Games. There are several Olympic rituals and symbols, such as the Olympic flag and torch, over 13,000 athletes compete at the Summer and Winter Olympic Games in 33 different sports and nearly 400 events. The first, second, and third-place finishers in each event receive Olympic medals, gold, silver, the Games have grown so much that nearly every nation is now represented. This growth has created numerous challenges and controversies, including boycotts, doping, bribery, every two years the Olympics and its media exposure provide unknown athletes with the chance to attain national and sometimes international fame. The Games also constitute an opportunity for the host city and country to themselves to the world. The Ancient Olympic Games were religious and athletic festivals held every four years at the sanctuary of Zeus in Olympia, competition was among representatives of several city-states and kingdoms of Ancient Greece. These Games featured mainly athletic but also combat such as wrestling. It has been written that during the Games, all conflicts among the participating city-states were postponed until the Games were finished. This cessation of hostilities was known as the Olympic peace or truce and this idea is a modern myth because the Greeks never suspended their wars. The truce did allow those religious pilgrims who were travelling to Olympia to pass through warring territories unmolested because they were protected by Zeus
11.
French Academy of Sciences
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The French Academy of Sciences is a learned society, founded in 1666 by Louis XIV at the suggestion of Jean-Baptiste Colbert, to encourage and protect the spirit of French scientific research. It was at the forefront of developments in Europe in the 17th and 18th centuries. Currently headed by Sébastien Candel, it is one of the five Academies of the Institut de France, the Academy of Sciences makes its origin to Colberts plan to create a general academy. He chose a group of scholars who met on 22 December 1666 in the Kings library. The first 30 years of the Academys existence were relatively informal, in contrast to its British counterpart, the Academy was founded as an organ of government. The Academy was expected to remain apolitical, and to avoid discussion of religious, on 20 January 1699, Louis XIV gave the Company its first rules. The Academy received the name of Royal Academy of Sciences and was installed in the Louvre in Paris, following this reform, the Academy began publishing a volume each year with information on all the work done by its members and obituaries for members who had died. This reform also codified the method by which members of the Academy could receive pensions for their work, on 8 August 1793, the National Convention abolished all the academies. Almost all the old members of the previously abolished Académie were formally re-elected, among the exceptions was Dominique, comte de Cassini, who refused to take his seat. In 1816, the again renamed Royal Academy of Sciences became autonomous, while forming part of the Institute of France, in the Second Republic, the name returned to Académie des sciences. During this period, the Academy was funded by and accountable to the Ministry of Public Instruction, the Academy came to control French patent laws in the course of the eighteenth century, acting as the liaison of artisans knowledge to the public domain. As a result, academicians dominated technological activities in France, the Academy proceedings were published under the name Comptes rendus de lAcadémie des sciences. The Comptes rendus is now a series with seven titles. The publications can be found on site of the French National Library, in 1818 the French Academy of Sciences launched a competition to explain the properties of light. The civil engineer Augustin-Jean Fresnel entered this competition by submitting a new theory of light. Siméon Denis Poisson, one of the members of the judging committee, being a supporter of the particle-theory of light, he looked for a way to disprove it. The Poisson spot is not easily observed in every-day situations, so it was natural for Poisson to interpret it as an absurd result. However, the head of the committee, Dominique-François-Jean Arago, and he molded a 2-mm metallic disk to a glass plate with wax
12.
Orders of magnitude (length)
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The following are examples of orders of magnitude for different lengths. To help compare different orders of magnitude, the following list describes various lengths between 1. 6×10−35 meters and 101010122 meters,100 pm –1 Ångström 120 pm – radius of a gold atom 150 pm – Length of a typical covalent bond. 280 pm – Average size of the water molecule 298 pm – radius of a caesium atom, light travels 1 metre in 1⁄299,792,458, or 3. 3356409519815E-9 of a second. 25 metres – wavelength of the broadcast radio shortwave band at 12 MHz 29 metres – height of the lighthouse at Savudrija, Slovenia. 31 metres – wavelength of the broadcast radio shortwave band at 9.7 MHz 34 metres – height of the Split Point Lighthouse in Aireys Inlet, Victoria, Australia. 1 kilometre is equal to,1,000 metres 0.621371 miles 1,093.61 yards 3,280.84 feet 39,370.1 inches 100,000 centimetres 1,000,000 millimetres Side of a square of area 1 km2. Radius of a circle of area π km2,1.637 km – deepest dive of Lake Baikal in Russia, the worlds largest fresh water lake. 2.228 km – height of Mount Kosciuszko, highest point in Australia Most of Manhattan is from 3 to 4 km wide, farsang, a modern unit of measure commonly used in Iran and Turkey. Usage of farsang before 1926 may be for a precise unit derived from parasang. It is the altitude at which the FAI defines spaceflight to begin, to help compare orders of magnitude, this page lists lengths between 100 and 1,000 kilometres. 7.9 Gm – Diameter of Gamma Orionis 9, the newly improved measurement was 30% lower than the previous 2007 estimate. The size was revised in 2012 through improved measurement techniques and its faintness gives us an idea how our Sun would appear when viewed from even so close a distance as this. 350 Pm –37 light years – Distance to Arcturus 373.1 Pm –39.44 light years - Distance to TRAPPIST-1, a star recently discovered to have 7 planets around it. 400 Pm –42 light years – Distance to Capella 620 Pm –65 light years – Distance to Aldebaran This list includes distances between 1 and 10 exametres. 13 Em –1,300 light years – Distance to the Orion Nebula 14 Em –1,500 light years – Approximate thickness of the plane of the Milky Way galaxy at the Suns location 30.8568 Em –3,261. At this scale, expansion of the universe becomes significant, Distance of these objects are derived from their measured redshifts, which depends on the cosmological models used. At this scale, expansion of the universe becomes significant, Distance of these objects are derived from their measured redshifts, which depends on the cosmological models used. 590 Ym –62 billion light years – Cosmological event horizon, displays orders of magnitude in successively larger rooms Powers of Ten Travel across the Universe
Media related to Distance indicators at Wikimedia Commons