unified atomic mass unit

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or (formerly)

(abbr. : amu or a.m.u.) symbol: u; a non‐SI unit of mass equal to one‐twelfth of the mass of one atom of carbon‐12; i.e.

1 u = ma(12C)/12 ≈ 1.660 540 × 10−27 kg.


Subjects: Chemistry.

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