On the Measurement of Vapor Pressures by Effusion

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Abstract
The effect of apparatus dimensions on the accuracy of vapor pressure measurements by Knudsen's effusion method is discussed for the usual type of experimental arrangement. It is shown that the total surface area of a condensed solid phase is not fundamentally related to the pressure of the effusing vapor. Equations are derived which may be used to check the pressure of the effusing vapor for saturation. Two cases in the literature are discussed.