Title: partial molar quantity
Long Title: IUPAC Gold Book - partial molar quantity
DOI: 10.1351/goldbook.P04418
Status: current

Definition
Change in the considered extensive quantity when an infinitesimal amount of substance is added to the system at constant temperature, pressure and amounts of all other constituents of the system divided by the added amount.

Related Terms
- amount of substance: https://goldbook.iupac.org//terms/view/A00297
- extensive quantity: https://goldbook.iupac.org//terms/view/E02281

Source
- Green Book, 2nd ed., p. 49 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/P04418/html
- json: https://goldbook.iupac.org/terms/view/P04418/json
- xml: https://goldbook.iupac.org/terms/view/P04418/xml

Citation: Citation: 'partial molar quantity' 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.P04418
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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: 2026-05-01T12:43:51+00:00