(K) is the evaporation temperature; *10−5 (Pa) is the pressure; *105 (m3/mole) is the molar volume of liquid; *105 (m3/mole) is the volume change in evaporation; *1010 (m) is the radius of atom (molecule); *103 (J/m2) is the surface tension coefficient; (J/mole) is the experimental molar evaporation heat; (J/mole) is the molar evaporation heat calculated from the geometrical volume; *105 (m3/mole) is “free volume” of liquid; (J/mole) is the molar evaporation heat calculated from “free volume”; and (%) are errors for and , respectively.