The diffusion flux is defined as: a) mass, per unit surface area, per unit time b) surface area, per unit time c) time, per unit surface area. d) the product of time and surface area, per unit mass

The correct answer is option a.

Explanation:

Diffusion flux is defined as movement of mas of atoms diffusing through the unit area in per unit time.It measured in ().

J = diffusion flux

A = Unit area A through which atoms moves.

M = mass of atoms passes in t interval of time.