surface excess Helmholtz energy

https://doi.org/10.1351/goldbook.S06177
Defined by: \[A^{\sigma }=U^{\sigma }- T\ S^{\sigma }\] where \(U^{\sigma }\) is the @[email protected], \(T\) is the @[email protected], and \(S^{\sigma }\) is the @[email protected]
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]