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hsod
on July 6, 2017
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NIST to redefine the kilogram based on a fundament...
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msimpson
on July 6, 2017
[–]
It's how the mass of the International Prototype Kilogram and its copies have drifted over time:
http://www.bipm.org/en/bipm/mass/ipk/
(verifications tab)
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