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Revised definitions of the SI base units, adopted at the 26th General Conference on Weights and Measures , that came into force on 20 May 2019
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 anniversary of the Metre Convention, the kilogram, ampere, kelvin, and mole are now defined by setting exact numerical values, when expressed in SI units, for t... Wikipedia