redefinition of SI base units

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revised definitions of the SI base units, adopted at the 26th General Conference on Weights and Measures (CGPM), that came into force on 20 May 2019

Adnoddau allanol

dynodwr Freebase

digwyddiad

newid

Wikibase reason for deprecated rank

16 Tachwedd 2018

pwynt mewn amser: 20 Mai 2019

2019 redefinition of the SI base units