4. Mass
4.1 Definition of a kilogram
The kilogram is one of the seven base units in the International System of Units (SI). Its definition was approved at the 26th General Conference on Weights and Measures (CGPM) in November 2018, and came into force on May 20, 2019. According to the CGPM:
The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of Planck's constant h, equal to 6.626 070 15 × 10 –34 when expressed in J·s, a unit equal to kg·m 2 ·s –1 , the meter and second being defined in terms of c and Δν Cs ...
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