NPR News: Say Au Revoir To That Hunk Of Metal In France That Has Defined The Kilogram

Say Au Revoir To That Hunk Of Metal In France That Has Defined The Kilogram
Research News
A small cylinder called Le Grand K has defined the kilogram for more than a hundred years. But if a scratch ever rendered it lighter, the definition of the kilo literally shifted. Time for a change.

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November 13, 2018 at 05:06PM
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