A generalized thermodynamic expression for Henry's constants is derived. The derivation is based on the statistical mechanics of dilute liquid solutions in conjunction with Scott's two-fluid theory and a reduced empirical equation of state; it is applicable to solid as well as fluid solutes. When Henry's constants are plotted against temperature, the correlation correctly predicts the maximum observed for some systems. The correlation is applied successfully to experimentally obtained Henry's constants covering seven orders of magnitude for 60 nonpolar binary systems.
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