unified atomic mass unit

synonym: atomic mass unit
https://doi.org/10.1351/goldbook.U06554
Non-SI unit of mass (equal to the atomic mass constant), defined as one twelfth of the mass of a carbon-12 atom in its ground state and used to express masses of atomic particles, \(\rm{u} \approx \pu{1.6605402(10)E-27 kg}\).
Sources:
Green Book, 2nd ed., p. 75 [Terms] [Book]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 997 [Terms] [Paper]
Citation: 'unified atomic mass unit' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.U06554 RIS BibTex EndNote
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