New universal relationships for surface tension and vaporization enthalpy of non-associated liquids

The methodology of thermodynamic similarity has been used to study the relation between the surface tension of a liquid and the vaporization enthalpy calculated per unit volume of the liquid phase. Simple reliable relationships that do not contain substance dependent parameters have been found. A new universal one-parameter relationship for the temperature dependence of the vaporization enthalpy has been suggested. The results of calculations with the use of these relationships are compared with experimental data.