Knudsen diffusion in a porous solid Porous silica gel is used to adsorb propane from helium at 373 K and 1 atm. Typical values of parameters for porous silica gel are as follows: porosity = 0.486, tortuosity = 3.35, and pore diameter = 22 A.
(a) Calculate the Knudsen number for flow inside the pores.
(b) Calculate the effective diffusivity of propane under these conditions.
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