Rest mass of an atom in its
ground state
. The commonly used unit is the
unified atomic mass unit
.
Sources: Green Book, 2
nd ed., p. 20 [
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]