In which of the following conditions mass transfer will occur spontaneously? C and z is concentration and distance respectively.
(a) dC/dz>0
(b) dC/dz<0
(c) dC/dz=0
(d) None of the Mentioned
I got this question by my school teacher while I was bunking the class.
The origin of the question is Concentration and Velocity in portion Modes and Diffusion of Mass Transfer