Atomic Mass Unit
Atomic Mass Unit : Nuclear Energy and Nuclear Disasters. (Phys; Abb: amu) A unit of mass defined as one-sixteenth the mass of an oxygen atom of mass number 16. Sixteen grams of 016 contain 6. 023 x 1023 atoms; hence one atom of 016 weighs 2. 656 x 10-23 gram. In terms of energy, 1 amu = 931 mev = 1. 49 x 10-3 erg. Also called: Absolute Mass Unit; Isotopic Mass Unit. See: Atomic Weight Unit. The international amu is defined as one-twelfth the mass of C12, which is the most abundant isotope of carbon. See: Avogaadro's Number
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