+1 vote
in Mass Transfer by (37.1k points)
For permanent gases diffusivity the order is _________ sq.m/s

(a) 10^-7

(b) 10^-8

(c) 10^-9

(d) 10^-10

I had been asked this question in an online interview.

This intriguing question originated from Molecular Diffusion in Solids in division Diffusion in Solids and Molecular Diffusion in Fluids of Mass Transfer

1 Answer

0 votes
by (39.8k points)
Right answer is (d) 10^-10

Easy explanation: The gas can become permeable to certain substance if it is in an order of 10^-10.

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