Defined by: \[H^{\sigma }=U^{\sigma }- \gamma \ A_{\text{s}}\] where \(U^{\sigma }\) is the @S06173@, \(\gamma \) is the @S06192@, and \(A_{\text{s}}\) is the area relative to a @G02635@.
Source: PAC, 1972, 31, 577. (Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry) on page 599 [Terms] [Paper]