Interpretation of Knudsen Vapor-Pressure Measurements on Porous Solids

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Abstract
A simple steady‐state model is used to describe the vaporization, in a Knudsen cell, of a porous solid having a low vaporization coefficient. The description is in terms of the effective vaporizing area of the solid. The nature of the effective area and the assumptions in the model are investigated. Procedures to obtain the equilibrium pressure and vaporization coefficient from pressures measured by varying the cell and sample geometry are discussed. A one‐parameter, empirical equation is presented which accurately represents measurements of the vapor pressure of porous arsenic taken over a large range of Knudsen‐cell orifice areas.

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