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Is the kilo losing weight?
The calibration experts at Tangent came across this very interesting article. The kilo is still defined by a man-made artifact — in this case a cylinder of metal made up of 90% platinum and 10% iridium that’s 1.54212598 inches high by 1.54212598 inches in diameter. Which, by definition, weighs exactly one kilo. The global standards are housed in SÈVRES, France. What's interesting is these standards have been diverging......
http://www.usatoday.com/tech/science/2011-04-18-kilo-weight.htm?csp=34news
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