Driving Force for adsorption is a surface phenomenon and consequence of surface energy .The surface of a liquid or solid is in a state of strain or unsaturation which results in unbalanced residual force at the surface .These unbalanced residual forces results in higher surface energy. Consequently, the surface of liquids/ solids always has tendency to attract and retain the molecular species with which it comes in contact. This tendency is responsible for the phenomenon of adsorption.