Before revision: Assuming the Langmuir Adsorption isotherm still applied to the adsorbed layer, is expected to vary with coverage, as follows: Langmuir's isotherm can be rearranged to this form: Substituting the expression of the equilibrium constant and taking the natural logarithm: BET equation 450px| Brunauer, Emmett and Teller (BET) model of multilayer adsorption, that is, a random distribution of sites covered by one, two, three, etc., adsorbate molecules.
After revision: Assuming the Langmuir Adsorption isotherm still applied to the adsorbed layer, is expected to vary with coverage, as follows: Langmuir's isotherm can be rearranged to this form: Substituting the expression of the equilibrium constant and taking the natural logarithm: BET equation Brunauer, Emmett and Teller (BET) model of multilayer adsorption, that is, a random distribution of sites covered by one, two, three, etc., adsorbate molecules.