Adsorption Isotherms

BET Isotherm (contd..)

Now, we calculate the total volume, V, of adsorbed material. V is proportional to the total number of particles adsorbed, and so

Because each layer contributes number of particles according to its thickness, i.e., a monolayer one particle, a bilayer site two particles etc.

If there were complete monolayer coverage the volume adsorbed would be V_mono, with

Because each site contributes only one particle to the total, it follows that00000000