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It's official: The 'kilogramme' has put on weight

Monday, January 7, 2013

WN.com - Science News
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It's official: The 'kilogramme' has put on weight
Jan 7th 2013, 10:19

LONDON: The official kilogramme - a cylinder-shaped hunk of metal - that defines the fundamental unit of mass, has itself gained weight, scientists say. Scientists at Newscastle University have found that due to surface contamination the original kilogramme is likely to be tens of microgrammes heavier than it was when the first standard was set in 1875. As a result, each country that has one of these standard masses has a slightly different...
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