Rate of formation of nuclei
Rate of nucleation = number of critical nucleus per unit volume per time.
(for single nuclei)
where is the collision frequency of the gas molecules which can be defined as the number of collisions per unit volume per unit area
For water vapor at
⌷
, ⌷
Then the critical rate of nucleation can be expressed as,
where the unit of
= number of critical nucleus per unit volume per time.
(for single nuclei)
is the collision frequency of the gas molecules which can be defined as the number of collisions per unit volume per unit area 
⌷ 
, 
⌷ 
can be expressed as,
