Abstract
A theory of the mean values of pressure, linear velocity of the carrier gas, and HETP is developed in gas chromatography. This theory involves two different variables: The length of the column and the flow rate of the gas carrier. The local values of pressure and linear velocity are defined as functions of the above variables and yield the calculation of the corresponding average local values. These mean values are discussed and two correlations between these values are developed which involve retention time and B oyle—M ariotte's law. The mean values of HETP expressed in terms of column length and retention time are discussed. Some applications are developed and some suggested, especially in the case of gas chromatography with variation of the carrier gas linear velocity.
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