04412 IUPAC Gold Book - partial isotherm 10.1351/goldbook.P04412 P04412 current synonym: individual isotherm 1 The function relating, at constant temperature and pressure, the amount of a particular component in the interfacial layer per unit area (or per unit mass of adsorbent) with its mole fraction (or concentration) in the liquid phase. This function can be evaluated only when the location and the thickness of the interfacial layer have been defined. adsorbent https://goldbook.iupac.org//terms/view/A00153 interfacial layer https://goldbook.iupac.org//terms/view/I03085 mole fraction https://goldbook.iupac.org//terms/view/A00296 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 594 (https://doi.org/10.1351/pac197231040577) https://goldbook.iupac.org/terms/view/P04412/html https://goldbook.iupac.org/terms/view/P04412/json https://goldbook.iupac.org/terms/view/P04412/plain Citation: 'partial isotherm' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.P04412 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-06-05T00:32:02+00:00