This paper reports experimentally determined excess molar enthalpies, H-m(E), excess heat capacities, C-p(E), densities, rho, and excess molar volumes, V-m(E), of propylene carbonate +1,2-epoxybutane at (288.15, 298.15 and 313.15 K) and atmospheric pressure. The results of H-m(E) and V-m(E) are compared with those predicted by an extended cell model elaborated by [I. Prigogine, The Molecular Theory of Solutions, North-Holland, Amsterdam (1957)]. Experimental H-m(E) values are positive and show only small changes with the increase of temperature, while V-m(E) data are always negative and decrease with the increase of temperature. Also C-p(E) Values are negative for all mixtures. Results have been qualitatively interpreted in terms of molecular interactions.