Densities (p) for binary systems of (1,.2,4-trimethylbenzene, or 1,3,5-trimethylbenzene + propyl acetate, or butyl acetate) were determined at four temperatures (298.15, 303.15, 308.15, and 313.15) K over the full mole fraction range. The excess molar volumes (V-E) calculated from the density data show that the deviations from ideal behaviour in the systems (all being positive, excepting 1,2,4-trimethylbenzene + butyl acetate system) become more positive with the temperature increasing. Surface tensions (sigma) of these binary systems were measured at the same temperatures (298.15, 303.15, 308.15, and 313.15) K by the pendant drop method, the surface tension deviations (delta sigma) for all system are negative.. and decrease with the temperature increasing. The V-E and delta sigma are fitted to the Redlich-Kister polynomial equation. Surface tensions were also used to estimate surface entropy (S-sigma) and surface enthalpy (H-sigma). (c) 2006 Elsevier Ltd. All rights reserved.