{"term":{"id":"03786","title":"mean substance rate","longtitle":"IUPAC Gold Book - mean substance rate","doi":"10.1351\/goldbook.M03786","code":"M03786","status":"current","definitions":[{"id":1,"text":"The amount of substance of a specified component changed in or moved to or from a system divided by the time during which the component was changed or moved. This kind of quantity usually should be preferred to mean mass rate or mean volume rate.","links":[{"term":"amount of substance","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/A00297"},{"term":"mean mass rate","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/M03784"},{"term":"mean volume rate","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/M03787"}],"sources":["PAC, 1979, 51, 2451. 'Quantities and Units in Clinical Chemistry' on page 2475 (https:\/\/doi.org\/10.1351\/pac197951122451)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/M03786\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/M03786\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/M03786\/plain"},"citation":"Citation: 'mean substance rate' 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.M03786","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":"2026-04-18T21:25:49+00:00"}}