Lecture 18: Diffusion: Fick’s First and Second Laws

Fick’s First and Second Laws of Diffusion x C(x) x First law: J= D dC dx Flux, J, at position xis proportional to the concentration gradient at that position. Second law: dC dt = D d2C dx2 Rate of change in concentration at position xis proportional to the derivative of the concentration gradient.

  Lecture, First, Second, Diffusion, Lecture 18, Fick, Fick s first and second, S first and second