Term: reduced mobile phase velocity, \(\nu\)
https://doi.org/10.1351/goldbook.R05215

Definition:
A term used mainly in liquid chromatography. It compares the mobile phase velocity with the velocity of diffusion into the pores of the particles (the so-called diffusion velocity, u D): \[\nu=\frac{\overline{u}}{u_{\text{D}}}=\frac{\overline{u}\ d_{\text{p}}}{D_{\text{M}}}\] In open-tubular chromatography: \[\nu=\frac{\overline{u}\ d_{\text{c}}}{D_{\text{M}}}\]

Related Terms:
1) chromatography (http://doi.org/10.1351/goldbook.C01075).
2) diffusion (http://doi.org/10.1351/goldbook.D01716).

Source: PAC, 1993, 65, 819. 'Nomenclature for chromatography (IUPAC Recommendations 1993)' on page 840 (https://doi.org/10.1351/pac199365040819)

Citation: 'reduced mobile phase velocity, \(\nu\)' 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.R05215

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