Nobody's Exactly Sure How Much A Kilogram Is Right Now

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Tom Scott

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Shared June 27, 2016

Yes, it's only micrograms of difference, but it's still really weird: until 2018, the kilogram is defined as "the weight of this physical object". So what happens when that object changes?

Thank you to everyone at the National Physical Laboratory! You can visit them at http://npl.co.uk

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