Title: mean substance rate
Long Title: IUPAC Gold Book - mean substance rate
DOI: 10.1351/goldbook.M03786
Status: current

Definition
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.

Related Terms
- amount of substance: https://goldbook.iupac.org//terms/view/A00297
- mean mass rate: https://goldbook.iupac.org//terms/view/M03784
- mean volume rate: https://goldbook.iupac.org//terms/view/M03787

Source
- PAC, 1979, 51, 2451. 'Quantities and Units in Clinical Chemistry' on page 2475 (https://doi.org/10.1351/pac197951122451)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/M03786/html
- json: https://goldbook.iupac.org/terms/view/M03786/json
- xml: https://goldbook.iupac.org/terms/view/M03786/xml

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.
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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: 2026-04-18T21:25:28+00:00