|Definition:|| SI unit of mass, taking the fixed numerical value of the Planck constant h to be 6,626 070 15 × 10−34 when expressed in the unit s−1 m2 kg, where the metre and the second are chosen as units of length and time, respectively
Note 1 to entry: The definition in the SI Brochure is: "The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6,626 070 15 × 10−34 when expressed in the unit J s, which is equal to kg m2 s−1, where the metre and the second are defined in terms of c and ΔνCs."
Note 2 to entry: The definition of the kilogram in IEV 112-02-06:2010-01 was: "SI unit of mass, equal to the mass of the object called the “international prototype of the kilogram” kept at the International Bureau of Weights and Measures (BIPM)."
Note 3 to entry: The kilogram is one of the seven SI base units: second (s), metre (m), kilogram (kg), ampere (A), kelvin (K), mole (mol) and candela (cd).