This work is a report of study carried out on the rate of evaporation from a liquid surface. In the theoretical approach, the Boltzmann transport equation with the simplified collision terms as modelled in the BGK equation was made use of. This collision term is taken to be the difference between the Maxwellian distribution of molecular velocities under equilibrium condition and the actual distribution function under non-equilibrium condition. The problem was formulated for both single component and two component cases. The resulting Itegro-differential equations were simplified to a set of...