* World Metrology Day
@ 2019-05-20 16:51 AdaMagica
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From: AdaMagica @ 2019-05-20 16:51 UTC (permalink / raw)
Today, May 20, 2019, on World Metrology Day, the redefinition of six SI base units has taken effect: Elementary Charge, Planck, Avogadro and Boltzmann constants have been fixed. Now except Candela, the other six SI base units are all defined on natural constants.
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