The mass diffusion rate dm/dt across a boundary between two different metals is a function of which of the following variables (four best answers):
A)concentration gradient dc/dx
B)contact area
C)density
D)melting point
E)thermal expansion
F)temperature
G)time

Question

Quizplus · Accepted Answer

Answers (a) and (b) are included in Equation (4.5).Temperature (f) has a strong influence on the diffusion coefficient.Time (g) figures into the process because it affects the concentration gradient; as time elapses, the concentration gradient is reduced so that the rate of diffusion is reduced.

The Mass Diffusion Rate Dm/dt Across a Boundary Between Two