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Atomic mass unit
A unit of mass equal to 1/12 the mass of a carbon-12 nucleus, which is 1.660 538 73 × 10-27 kg ± 0.000 000 13 × 10-27 kg (1998 CODATA values). Abbreviated as amu or u. Sometimes called the dalton, after John Dalton, architect of the first modern atomic theory.
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