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Imposing a pore size distribution of a fractal surface on the Dubinin approach for adsorption in porous materials yields the simple isotherm= X [ln (0/)]~ 3 in which is the relative adsorption, p0 and p are the saturation and equilibrium pressures, respectively, K is a constant, and D is the fractal dimen-sion of the surface accessible to adsorption. The isotherm has the form of the Frenkel-Halsey-Hill (FHH) equation, and thetheoretical range of the exponent 3-