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A comment on NIST to redefine the kilogram based on a fundamental universal constant. Parent comment

Re:NIST to redefine the kilogram based on a fundamental univ... by msimpson on Thursday July 06, 2017 @11:54AM (#14711301)
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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