Title: interstitial fraction
Long Title: IUPAC Gold Book - interstitial fraction
DOI: 10.1351/goldbook.I03120
Status: current

Definition
The interstitial volume per unit volume of a packed column. Defined by: \(\varepsilon_{\rm{I}}=\frac{V_{\rm{I}}}{X}\) where \(V_{\rm{I}}\) is the interstitial volume and \(X\) the column volume.

Related Terms
- column volume: https://dev.goldbook.iupac.org/terms/view/C01183
- interstitial volume: https://dev.goldbook.iupac.org/terms/view/I03122

Source
- Orange Book, 2nd ed., p. 100 (https://media.iupac.org/publications/analytical_compendium/)

Other Outputs
- html: https://dev.goldbook.iupac.org/terms/view/I03120/html
- json: https://dev.goldbook.iupac.org/terms/view/I03120/json
- xml: https://dev.goldbook.iupac.org/terms/view/I03120/xml

Citation: Citation: 'interstitial fraction' 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.I03120
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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: 2026-01-24T04:48:37+00:00