Title: number-distribution function
Long Title: IUPAC Gold Book - number-distribution function
DOI: 10.1351/goldbook.N04263
Status: current

Definition
A distribution function in which the relative amount of a portion of a substance with a specific value, or a range of values, of the random variable(s) is expressed in terms of mole fraction.

Related Terms
- mole fraction: https://goldbook.iupac.org//terms/view/A00296
- variable: https://goldbook.iupac.org//terms/view/V06600

Source
- Purple Book, 1st ed., p. 56 (http://old.iupac.org/publications/books/author/metanomski.html)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/N04263/html
- json: https://goldbook.iupac.org/terms/view/N04263/json
- xml: https://goldbook.iupac.org/terms/view/N04263/xml

Citation: Citation: 'number-distribution function' 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.N04263
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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: 2026-07-15T07:29:07+00:00