relative atomic mass (atomic weight), \(A_\text{r}\)

https://doi.org/10.1351/goldbook.R05258
The ratio of the average mass of the atom to the @U06554@.
See also:
standard atomic weights
Sources:
Green Book, 2nd ed., p. 41 [Terms] [Book]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 990 [Terms] [Paper]