substance concentration

https://doi.org/10.1351/goldbook.S06072
See:
amount of substance concentration
Source:
Green Book, 2nd ed., p. 42 [Terms] [Book]
See also:
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 994 [Terms] [Paper]