Question

Fick’s law is given by the formula

(a) N b = – D b c d C b/d x

(b) N b = – 2 D b c d C b/d x

(c) N b = – 3 D b c d C b/d x

(d) N b = – 4 D b c d C b/d x

This question was addressed to me during an interview.

The origin of the question is Fick’s Law-1 topic in section Modes and Diffusion of Mass Transfer

Answer 1

The correct choice is (a) N b = – D b c d C b/d x

For explanation: Experimental evidences shows that molecular diffusion is goverened by the empirical relation suggested by Fick.