Term: interstitial fraction
https://doi.org/10.1351/goldbook.I03120

Definition:
The interstitial volume per unit volume of a packed column. Defined by: ɛI = VI/X where V I is the interstitial volume and X the column volume.

Related Terms:
1) interstitial volume (<em>in gas chromatography</em>) (http://doi.org/10.1351/goldbook.I03122).
2) column volume (<em>in gas chromatography</em>) (<em>in chromatography</em>) (http://doi.org/10.1351/goldbook.C01183).

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

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. https://doi.org/10.1351/goldbook.I03120

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