May 19
REVISED SI LAUNCH

On 20 May 2019 the International System of Units as we know it now with the International Prototype of the Kilogram (IPK) as the universal standard for mass, is replaced by the Revised SI where all units are defined in terms of constants that describe the natural world. In the revised SI four of the SI base units – namely the kilogram, the ampere, the kelvin and the mole – are redefined in terms of fixed numerical values of the Planck constant (h), the elementary charge (e), the Boltzmann constant (k), and the Avogadro constant (NA), respectively. Further, the new definitions of all seven base units of the SI are also uniformly expressed using the explicit-constant formulation.

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