Discussion
Consider the following statements about Knudsen diffusion.
1. It dominates when the pore size is comparable with the mean free path.
2. Its coefficient depends on pore radius and molecular speed.
3. It is faster than bulk diffusion in the same pore.
Answer: A
The first two are correct. The third is wrong, since collisions with the wall impede the molecule and make Knudsen diffusion the slower of the two. Pore size decides which regime applies. The mean free path sets the boundary.
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