Physical adsorption of SO_2 on exfoliated graphite is studied using classical adsorption volumetry and Monte Carlo computer simulations. The experimental isotherms have been obtained in a wide temperature range to determine the critical temperature for the completion of several layers. The computer simulations are in good agreement with the experimental data. The adsorption potential is analyzed and the results are employed to interpret the distributions of adsorbed molecules according to the gas-solid energy. The adsorbed phase exhibits a certain degree of order in an incommensurate phase with respect to the graphite surface. From the simulations, the structure of the adsorbed phase is analyzed, and the unit cell edge length is estimated.
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