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The kilogram, symbol kg, is the SI unit of mass. As of 2019 it is defined by taking the fixed numerical value of the [Planck constant] h to be 6.62607015×10−34 when expressed in [the unit] J⋅s, which is equal to kg⋅m2⋅s−1, where the meter and [the second] are defined in terms of c and ΔνCs.
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