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Created with Fabric.js 1.4.5 Kg The kilogram originated in reforms of the French Revolution and was made to be the mass of a cubic decimetre of water, at water's maximums density (water at roughly 4oC). Months later researchers were able to conclude that the mass of a cubic decimetre of water at its maximum density was 99.92072% of the mass of the provisional kilogram. Originally called grave till its name changed in 1795, the say year in which Lefรจvre-Gineau was asked to determine how massive a cubic decimetre of water truly is. In the meantime a provisional kilogram was made and expected to be close enough to the final value used for commercial purposes. In order for the new weights and measures system, former royal jeweller, Marc Etienne was calledto Paris as he had fled France at the start of the revolution. 1796 Marc Etienne successfully created kilogram masses, from which one was declared the official prototype of the kilogram in 1799. Which has since been titled the Kilogramme des Archives. A series of conferences (1870,1872) were held which discussed matters concerning the metric system. They concluded that the new standsof kilogram should be made of a platinum alloy rather than pure platinum. After many failed attempts the job was entrusted to the London firm of Johnson, Matthey, specilizing in precious metals. Once they succeed the French were able to produce standards based the prototype created. Kg is the only SI unit that isn't defined by a natural constant, rather by an physical object. The only SI unit to have a prefix in its name. The first CGPM conference was held in 1889 in order to determinethe new International Prototype Kilogram, judged by determining which one most closely match the Kilogramme des Archives. After many failed attempts the job was entrusted to the London firm of Johnson, Matthey, specilizing in precious metals. Once they succeed the French were able to produce standards based the prototype created. Scientist are now trying to find a natural constant from which the kilogram can be based off. The vaule of kilogram changes each year and is currently decreasing in mass.
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