{"term":{"id":"01209","title":"component","longtitle":"IUPAC Gold Book - component","doi":"10.1351\/goldbook.C01209","code":"C01209","status":"current","statusreason":"unpub def","redirectto":null,"definitions":[{"id":1,"text":"Constituent of a mixture the amount or concentration of which can be varied independently. The number of components in a given system is the minimum number of independent species necessary to define the composition in all the phases of a system. It may vary with external conditions since additional chemical equilibria reduce the number of components. The term component is also often used in the more general sense as defined here under constituent.","links":[{"term":"amount","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/A00297"},{"term":"concentration","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/C01222"},{"term":"constituent","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/C01281"}],"sources":["Physical Chemistry Division, unpublished"],"seealso":["PAC, 1996, 68, 957. 'Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)' on page 966 (https:\/\/doi.org\/10.1351\/pac199668040957)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/C01209\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/C01209\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/C01209\/plain"},"citation":"Citation: 'component' 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.C01209","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":"2026-05-08T21:33:14+00:00"}}