Collision frequency is defined in chemical kinetics, in the background of theoretical kinetics, as the average number of collisions between reacting molecules per unit of time. Its symbol is Z. For a gas phase bimolecular reaction Z is
- NA is the number of atoms B per unit volume (m^3)
- σAB is the reaction cross section
- kB is Boltzmann constant
- μaB is the reduced mass of the reactants
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