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abstraction > mathematical concept > unit > mass unit > atomic mass unit |
atomic mass unit comparison table |
Subject | has equivalent | has proposal date | has definition | has symbol | has approval agency | has synonym | is a kind of | has approval date | is an instance of |
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mass unit | unit | ||||||||
atomic mass unit | 1.6605402 × 10-27 kg | 1959 | The masses of atoms and molecules are generally given in atomic mass units. These units are based on a scale in which the mass of carbon 12 is taken to be 12. Atomic masses were originally given as atomic weights on a scale where the mass of the hydrogen atom was unity, later they were based on oxygen or oxygen 16; these scales have all been replaced by the carbon 12 scale. | u | International Union of Pure and Applied Physics | dalton | 1960 | mass unit |
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