INTRODUCTIONIn chromatography, flow rates should be standardized for columns of different dimensions by expressing the flow rate as linear flow velocity (cm/h). This is defined as the volumetric flow rate (cm3/h) per unit cross-sectional area (cm2) of a given column. However, flow rates are usually measured as volumetric flow rates (mL/min). It is therefore necessary to be able to convert between the units, which can be done using the equation described here.