It is shown that the equation of Reisset al.for the surface tension of liquids composed of hardhyphen;core molecules does not usually provide the proper dependence of surface tension on temperature for typical nonhyphen;ionic liquids. Because of this, an empirical computation procedure is adopted, whereby the hardhyphen;core diameter is given a temperature dependence similar to that of the collision cross section for gas viscosity. When Lennardhyphen;Jones 6ndash;12 or Sutherland intermolecularhyphen;potential data are then used to calculate a hardhyphen;core diameter, the agreement between computed and measured dependence of surface tension on temperature is usually very good, even for liquids composed of such polar, aspherical molecules as water, ethanol, and ammonia. As an illustration of the potential value of the empirical use of gashyphen;viscosity data for improving computations of the dependence on temperature of physical properties and thermodynamic values for liquids, the Lennardhyphen;Jones 6ndash;12 and Sutherland data are applied to two rigidhyphen;sphere relationships for liquid compressibility.
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