## atomic mass constant

https://doi.org/10.1351/goldbook.A00497
One twelfth of the mass of a carbon-12 atom in its nuclear and electronic @G02704@, $$m_{\text{u}} = 1.660\ 5402(10)\times 10^{-27}\ \text{kg}$$. It is equal to the @U06554@.
Sources:
CODATA Bull. 1986, 63, 1 [Terms] [Book]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 962 [Terms] [Paper]