Prior to the
2019 redefinition of SI base units
In 2019, four of the seven SI base units specified in the International System of Quantities were redefined in terms of natural physical constants, rather than human artifacts such as the standard kilogram.
Effective 20 May 2019, the 144th ...
, from 2005 to early 2019, the
SI base units were defined as follows.
References
SI units
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