Title: amount concentration
Long Title: IUPAC Gold Book - amount concentration
DOI: 10.1351/goldbook.A00295
Status: current
Index: quantity

Definition
Amount of a constituent divided by the volume of the mixture. Also called amount-of-substance concentration, substance concentration (in clinical chemistry) and in older literature molarity. For entities B it is often denoted by \(\left[\rm{B}\right]\). The common unit is mole per cubic decimetre (\(\pu{mol dm-3}\)) or mole per litre (\(\pu{mol L-1}\)) sometimes denoted by \(M\).

Related Terms
- amount-of-substance concentration: https://goldbook.iupac.org//terms/view/A00298
- concentration: https://goldbook.iupac.org//terms/view/C01222
- constituent: https://goldbook.iupac.org//terms/view/C01281
- litre: https://goldbook.iupac.org//terms/view/L03594
- molarity: https://goldbook.iupac.org//terms/view/M03977
- mole: https://goldbook.iupac.org//terms/view/M03980
- substance concentration: https://goldbook.iupac.org//terms/view/S06072

Source
- Green Book, 2nd ed., p. 42 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/A00295/html
- json: https://goldbook.iupac.org/terms/view/A00295/json
- xml: https://goldbook.iupac.org/terms/view/A00295/xml

Citation: Citation: 'amount concentration' 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.A00295
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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: 2026-04-19T04:08:06+00:00