Title: interface
Long Title: IUPAC Gold Book - interface
DOI: 10.1351/goldbook.I03082
Status: current

Definition
The plane ideally marking the boundary between two phases.

Note
The term should not be used synonymously with interphase.

Related Term
- interphase: https://goldbook.iupac.org//terms/view/I03118

Source
- PAC, 1986, 58, 437. 'Interphases in systems of conducting phases (Recommendations 1985)' on page 439 (https://doi.org/10.1351/pac198658030437)

Related References
- Orange Book, 2nd ed., p. 251 (https://media.iupac.org/publications/analytical_compendium/)
- 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 583 (https://doi.org/10.1351/pac197231040577)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/I03082/html
- json: https://goldbook.iupac.org/terms/view/I03082/json
- xml: https://goldbook.iupac.org/terms/view/I03082/xml

Citation: Citation: 'interface' 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.I03082
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: 2026-05-18T00:26:05+00:00