Gibbs surface 

https://doi.org/10.1351/goldbook.G02635
A geometrical surface chosen parallel to the interface and used to define the volumes of the bulk phases in the calculation of the extent of adsorption, and of other surface excess properties. Also referred to as Gibbs dividing surface.
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 588 [Terms] [Paper]
Citation: 'Gibbs surface' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.G02635 RIS BibTex EndNote
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