IEVref: | 112-02-06 | ID: | |

Language: | en | Status: Standard | |

Term: | kilogram | ||

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Synonym3: | |||

Symbol: | kg | ||

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} m^{2} 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 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). | ||

Publication date: | 2020-12 | ||

Source | SI Brochure, 9th edition, 2019, 2.3.1, modified – The definition in the SI Brochure has been revised to comply with the IEV rules. Notes 1 to 3 to entry have been added. | ||

Replaces: | 112-02-06:2010-01 | ||

Internal notes: | 2020-12-14: Tagging error corrected in Note 1 to entry: c corrected to <i>c</i>. JGO | ||

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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 m^{2} s^{−1}, where the metre and the second are defined in terms of *c* and Δ*ν*_{Cs}."

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).