The concept of three-dimensional energy of vaporization is applicable to the estimation of the unlikepair potential parameter 12 in the single-parameter Wilson equation when the following combination rules are used: 2 = -(2/z)u,zi u,z = Ui2d + ui2' for nonpolar-polar systems; u,z = ui2d + (u,p u2p)1/2 + ui2h for polar systems, where ui2d = (harmonic mean of molar volumes) X (harmonic mean of dispersion cohesive energy densities), u¡p is dipole energy of substance /, u^zi or ui2h is estimated from experimental data for a system similar In characteristics to the system in question. A factor 2/z, which accounts for a fraction of u, is chosen to be V3. The proposed method results in almost as good a
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