Atomic Mass Unit

Defined as one twelfth of the mass of the most abundant isotope of carbon (12C)

1 atomic mass unit = 1.66053873x10-27kg

Before 1960 the atomic mass unit was defined in terms of the mass of an oxygen isotope (16O) and 1 amu = 1.6599 x 10-27kg.

Abbreviated as amu or u. Sometimes called the dalton, after John Dalton, architect of the first modern atomic theory.

See also: Atomic weight, Dalton, John, Formula Weight, Isotopic Mass, Mass Number.

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Subjects: Nuclear and Particle Physics