interparticle volume of the column, $$V_{0}$$

in chromatography
https://doi.org/10.1351/goldbook.I03116
The volume occupied by the mobile phase between the particles in the packed section of a column. It is also called the interstitial volume or the void volume of the column. In @L03578@, the interparticle volume is equal to the mobile-phase hold-up volume ($$V_{\text{M}}$$) in the ideal case, neglecting any extra-column volume. In gas @C01075@, the symbol $$V_{\text{G}}$$ may be used for the interparticle volume of the column. In the ideal case, neglecting any extra-column volume, $$V_{\text{G}}$$ is equal to the corrected gas hold-up volume ($$V_{\text{M}}^{\text{o}}$$). $V_{\text{G}}=V_{\text{M}}^{\text{o}}=V_{\text{M}j}$
Source:
PAC, 1993, 65, 819. (Nomenclature for chromatography (IUPAC Recommendations 1993)) on page 832 [Terms] [Paper]