column volume, Vcin chromatography

The geometric volume of the part of the tube that contains the packing:

$V c = A c L$

where $A c$ is the internal cross-sectional area of the tube and $L$ the length of the packed part of the column. In the case of wall-coated open-tubular columns the column volume corresponds to the geometric volume of the whole tube having a liquid or a solid stationary phase on its wall.

Source:

PAC, 1993, 65, 819 (Nomenclature for chromatography (IUPAC Recommendations 1993)) on page 832