## Wikipedia - Number density number concentration, $$C$$, $$n$$

https://doi.org/10.1351/goldbook.N04260
@N04266@ of a @C01281@ in a mixture divided by the volume of the mixture.
See:
concentration
Sources:
Green Book, 2nd ed., p. 39 [Terms] [Book]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 984 [Terms] [Paper]