From: AdaMagica <christ-usch.grein@t-online.de>
Subject: World Metrology Day
Date: Mon, 20 May 2019 09:51:02 -0700 (PDT)
Date: 2019-05-20T09:51:02-07:00 [thread overview]
Message-ID: <a8dae12b-0ce3-49ad-a636-df02b511263a@googlegroups.com> (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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