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atomic mass unit1.6605402 × 10-27 kg1959The 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where the mass of the hydrogen atom was unity, later they were based on oxygen or oxygen 16; these scales have all been replaced by the carbon 12 scale.uInternational Union of Pure and Applied Physicsdalton 1960mass unit

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