The surface pressure (π) and the area occupied per adsorbed molecule (A) on the silica gel/carbon tetrachloride (or cyclohexane) interface have been calculated by the Gibbs adsorption equation from the adsorption isotherms of aliphatic alcohol, cyclohexanol, anisole, benzaldehyde and propyl acetate. The resulting π-A curves were similar to the liquid expanded state on water. All the curves can be represented by the Smith's equation. The equation is π [A(1-A~0/A)^2] =kT where A~0 is the limiting area per molecule at adsorption on the solid/liquid interface.

Key words: FILMS, ADSORPTION, INTERFACES