{"term":{"id":"02181","title":"equilibrium film","longtitle":"IUPAC Gold Book - equilibrium film","doi":"10.1351\/goldbook.E02181","code":"E02181","status":"current","definitions":[{"id":1,"text":"A liquid film of thickness, or thicknesses, at which it is stable or metastable with respect to small thickness changes. Unless the area of the film is small, its composition may not be the same over its area and the (metastable) equilibrium thickness may be characteristic of the local condition only.","links":[{"term":"film","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/F02366"},{"term":"metastable","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/M03872"},{"term":"metastable","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/S05901"},{"term":"stable","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/S05900"}],"sources":["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 614 (https:\/\/doi.org\/10.1351\/pac197231040577)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/E02181\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/E02181\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/E02181\/plain"},"citation":"Citation: 'equilibrium film' 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.E02181","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.","collection":"If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .","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.","accessed":"2026-04-08T02:03:49+00:00"}}