collision density, \(Z_{\textrm{AA}}\)

https://doi.org/10.1351/goldbook.C01162
Total @C01166@ for all molecules within a volume divided by that volume.
Source:
Green Book, 2nd ed., p. 56 [Terms] [Book]
See also:
PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 158 [Terms] [Paper]