Fundamentals of adsorption equilibria 45 / m E 0 qp,= x o. I m ,.I I I I ..... , I ,,, 0 0.1 0.2 0.3 0.4 0.5 Figure 3.6 Estimation of monolayer volume from BET plot. Data is for N2 adsorbed on silica gel at 77 K.