Not such a big deal, but the kilogram has gained weight

January 07, 2013 17:34

The official kilogram - 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 kilogram is likely to be tens of micrograms heavier than it was when the first standard was set in 1875.

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