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From [Heterogeneous Catalysis in Industrial Practice/Charales N. Satterfield 2 ed.]
In a series of interconnected pores of varying cross section, in general most of the pore volume empties at a pressure corresponding to the radius of the largest circle that can be inscribed in the throat. In predicting rates of diffusion within porous catalysts the restrictions contribute a resistance that is not offset by the enlargements, so for this purpose it is throat rather than cavity dimension that is of importance and the desorption curve ma be better measure of pore size.

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