number density, \(n\)

https://doi.org/10.1351/goldbook.N04262
Number of particles divided by the volume they occupy.
Sources:
Green Book, 2nd ed., p. 39 [Terms] [Book]
PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2183 [Terms] [Paper]