Materials Science and Engineering: An Introduction

Published by Wiley
ISBN 10: 1118324579
ISBN 13: 978-1-11832-457-8

Chapter 5 - Diffusion - Questions and Problems - Page 162: 5.6

Answer

Fick’s first law states steady that state diffusion is given by: $$J=-D\frac{dc}{dx} $$ where $\frac{dc}{dx}$ is the concentration gradient, D is the diffusion coefficient, and J is the diffusion flux. In Fick’s first law it is assumed that the concentration gradient is independent of time, so flux is also independent of time.

Work Step by Step

Fick’s first law states steady that state diffusion is given by: $$J=-D\frac{dc}{dx} $$ where $\frac{dc}{dx}$ is the concentration gradient, D is the diffusion coefficient, and J is the diffusion flux. In Fick’s first law it is assumed that the concentration gradient is independent of time, so flux is also independent of time.
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