Extended Generic Nature of Surface Entropy

The recent empirical correlation for the surface tension is further investigated for universality. C5-C8 liquid hydrocarbons, for which accurate surface tension data over the complete liquid range are available, are used. Functional reduced surface entropy is derived, which is in the general form of Trouton’s rule. It is characterized by the critical exponent of surface tension and is valid with the unique value 0.9990 at any temperature from freezing to critical temperature of the liquid hydrocarbons. Relation to generic nature of surface entropy is pursued.