Atomic mass constant

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See also Unified atomic mass unit

In physics, the atomic mass constant mu is 1/12 of the mass of the 12C nuclide, in its ground state and at rest.

By definition mu is equal to 1 u the unified atomic mass unit. The latest value is mu = 1.660 538 782 × 10−27 kg.[1]


  1. Retrieved on December 4, 2007 from NIST website