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surface excess Gibbs energy

Defined by
G σ = H σ − T S σ = A σ − γ A s
where H σ is the surface excess enthalpy, T is the thermodynamic temperature, S σ is the surface excess entropy, A σ is the surface excess Helmholtz energy, γ is the surface tension, and A s is the area relative to a Gibbs surface.
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
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
Last update: 2014-02-24; version: 2.3.3.
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