NEW DEFINITION OF SI UNITS- KG, METER, SECOND, AMPERE AND KELVIN

The 2019 redefinition of the SI base unitscame into force on 20 May 2019, the 144th anniversary of the Metre Convention. In the redefinition, four of the seven SI base units– the kilogram, ampere, kelvin, and mole– were redefined by setting exact numerical values for the Planck constant (h), the elementary electric charge (e), the Boltzmann constant (k), and the Avogadro constant (NA), respectively. The second , metre, and candela were already defined by physical... Continue Reading →

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