What is the $SI$ unit of mass? How is it defined?
(N/A) The $SI$ unit of mass is the kilogram $(kg)$.
It is defined by taking the fixed numerical value of the Planck constant,$h$,to be $6.62607015 \times 10^{-34}$ when expressed in the unit $J \cdot s$,which is equal to $kg \cdot m^2 \cdot s^{-1}$,where the meter and the second are defined in terms of $c$ and $\Delta \nu_{Cs}$.
It is defined by taking the fixed numerical value of the Planck constant,$h$,to be $6.62607015 \times 10^{-34}$ when expressed in the unit $J \cdot s$,which is equal to $kg \cdot m^2 \cdot s^{-1}$,where the meter and the second are defined in terms of $c$ and $\Delta \nu_{Cs}$.
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