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出典:Wikipedia
出典:『Wikipedia』 (2010/08/31 11:47 UTC 版)
In physics and chemistry, the atomic mass constant, mu, is one twelfth of the mass of an unbound atom of carbon-12 at rest and in its ground state. It serves to define the atomic mass unit and is, by definition, equal to 1 u. The 2006 CODATA recommended value is 1.660 538 782(83)×10−27 kg.
atomic mass constant