Abstract Among thermodynamic properties, surface tension is an important physical property that shows information about surface composition and exerts a considerable influence on the transfer of mass and energy across interface [1]. Surface tension of mixtures is often very sensitive to small changes in composition of the mixtures, and a detailed knowledge of this dependency is important for many fields [2]. In this study, we predicted surface mole fraction of some organic binary mixtures by Sprow- Prausnitz model [3] and different relations between surface mole fraction and bulk mole fraction of studied system have been considered
