hiiii

collison frequency :-

it is defined as  the average number of collisions between reacting

molecules per unit of time. Its symbol is Z

where

* 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

and collison number is simple a quantity showing algebric numbers .. becoz of

unstable values of this we calculate the frequency !!!!!