Term: non-linear distribution isotherm https://doi.org/10.1351/goldbook.NT06936 Definition: A distribution isotherm which is not linear. Note: A non-linear isotherm can have several shapes, as classified by Brunauer et al. In @C01075@ convex or concave shapes are common, as well as combinations. Related Terms: 1) chromatography (http://doi.org/10.1351/goldbook.C01075). 2) distribution isotherm (in chromatography) (http://doi.org/10.1351/goldbook.DT06932). Source: PAC, 1996, 68, 1591. 'Nomenclature for non-linear chromatography (IUPAC Recommendations 1996)' on page 1593 (https://doi.org/10.1351/pac199668081591) Citation: 'non-linear distribution isotherm' 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.NT06936 License: 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. Disclaimer: 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.