Liquid Structure and Energy of Vaporization

Abstract

The equation derived by Hildebrand and Wood for the potential energy of a liquid in terms of its structure, as determined by x‐ray scattering, has been tested by the aid of the structures determined by Thomas and Gingrich for potassium at 70° and 395°. The ratio of the energy of vaporization is calculated to be 1.154 while the same ratio as determined by aid of the vapor pressure curve is 1.155. The decrease in the van der Waals a is the same for potassium and benzene for temperature intervals corresponding to equal expansion ratios.