The kilogram is the last of the seven base units of the international measurement system, which is

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EXPENSIVE standards. German National Metrology Institute physicist Peter Becker holds one of the two silicon spheres whose production was paid 3.2 million dollars. They will form a new definition of the kilogram standard Photo: THE LOS ANGELES TIMES
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supplemented (13:06) - Putin announces full combat readiness of the Western Military District and the Northern fleet adds 38 (14:21) - PHOTO and VIDEO: The Freedom Monument been placed flowers; march removed without incident 68 How weighs a kilo? 1 Author: Dzjažui CUNA, Los Angeles Times. On 4 May 2008 09:33 0 Email
What is heavier - a kilogram or kilogram lead down? With such a jigsaw task of physics is sometimes tend to catch the stupid pupils, but nowadays even the giants of science in the middle there is no consensus as to what is the right kilogram of weight
Americans owned kilogram No. 20 hidden 12 meters below ground in a special repository Maryland state. The small cylinder made of platinum and iridium, cheryl cole shoes is the perfect kilogram standard. Truth be told, almost perfect. 120 years since France was made kilogram No. 20 and dozens of other standard kilogram copy of them appeared irrational differences.
The average difference is about 50 micrograms or twentieth of a milligram. It is a small salt-kernel weight, but the kilogram standard fluctuations caused physicists cheryl cole shoes concern as the kilogram is the unit of measurement used in determining the other, from the gravity and to approximately the Planck constant, cheryl cole shoes which plays an important role in the theory of quantum mechanics.
In fact, a remnant of the past today, no one really knows how much weighs a kilo. Therefore, scientists are trying cheryl cole shoes to find a new way to define the weight of the unit. They want to opt out of a particular subject as benchmark applications. Instead, cheryl cole shoes could be a characteristic or a scientific constant. Similar changes have affected the measurement of time, since the second benchmark is now used cesium atomic fluctuations.
The kilogram is the last of the seven base units of the international measurement system, which is based on a physical object. It is a remnant of the past era, when the theory of relativity and quantum mechanics had not yet changed our understanding of the universe. "The problem is that researchers in other fields of science do not want to match the main constants of this object made of the XIX century," says Richard Davis, cheryl cole shoes who is the International Bureau of Weights cheryl cole shoes and Measures cheryl cole shoes Division mass driver.
Researchers' efforts to revise the definition of the kilogram as the main deals with two ideas. One of them proposes to count a trillion trillion atoms that make up the perfect silicon sphere. The second resolution cheryl cole shoes urges the measured electrical current necessary to balance one kilogram of weight against gravity. Both proposals were difficult to serious problems.
XVIII century the world had hundreds of thousands of different weights. France alone had about 250 000. The Age of Enlightenment and the Great French Revolution at the end of XVIII century paved the way for the introduction of standards. Philosophers believed that a person will only be free if the same will be able to figure out the things he needed weight and cost. The French government introduced a kilogram in 1795. Kilogram was defined as the weight of a liter of distilled water temperature of melting ice. After a century Metra contract cheryl cole shoes was kilogram of international standard.
Per kilogram model in cylindrical rod of 1878 made of 90% platinum and 10% iridium. This is known as Le Grand K or international prototype. At that time produced 40 copies, which were distributed to the world's national governments. Later, cheryl cole shoes another 50 copies were made. 90 kilogram copies are used as the standard kilogram, which is used in science and industry. At least six copies over the years has been lost or damaged.
All copies of the kilogram standard time in 50 years, is delivered to the International Bureau of Weights and Measures in Sevres headquarters in France to compare with Le Grand K. The big comparison time around 1950, scientists noticed that Le Grand K, and a copy of the weight is different. Nobody did not know how to tell you why they have such differences.
Kilogram gain weight cheryl cole shoes Scientists have discovered that non-compliance problems also affected other units, cheryl cole shoes so decided to modernize the system of units. Metra benchmark already in 1960, was changed from two stripes on a platinum-iridium bar, which was replaced by n