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