English: Schematic drawing of a molecule in a cylindrical pore in the case of Knudsen diffusion; are indicated the pore diameter (d) and the free path of the particle (l).
Italiano: Rappresentazione schematica di una particella sotto diffusione di Knudsen all'interno di un poro cilindrico. Sono indicati il diametro del poro (d) e il cammino libero medio della particella (l).
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