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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 per moles of reactant. Its symbol is Z. For a gas-phase bimolecular reaction, Z is
- NA is Avogadro's number,
- σAB is the reaction cross-section,
- kB is Boltzmann constant,
- T is temperature in kelvins,
- μAB is the reduced mass of the reactants.