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> The SI — the modern metric system — has seven base units from which all other measurement units can be derived. On May 20, 2019, four of them — the kilogram, kelvin, ampere and mole — were redefined in terms of constants of nature. The remaining three — the second, meter, and candela — are already based on universal constants.

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Redefinition

This November, in , , representatives from 57 countries are expected to make history.  They will vote

nist.gov/si-redefinition

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