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Diffusion Rate and Concentration

  1. Oct 12, 2014 #1
    So the rate of diffusion is dependent upon the speed of the molecules and the existence of a concentration gradient.

    What about the concentration of the particles themselves?

    Diffusion is dependent upon mean free path and concentration is inversely proportional to mean free path. So does that mean that the diffusion rate is inversely proportional to concentration?

    So if you had two compartments and two different scenarios:

    Case 1: 10M seperated from 1 M

    Case 2: 20M seperated from 11M

    Diffusion would be faster in the first case? This is confusing because apparently net flux here is the same according to my textbook since the difference is the same.
  2. jcsd
  3. Oct 17, 2014 #2
    Thanks for the post! Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
  4. Oct 17, 2014 #3


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    Well, real-world diffusion problems usually consider the diffusion of a tracer in some other medium. So I suppose you would have to ask whether the concentrate of the tracer is significantly affecting the mean free path given all the other particles belonging to the (background) medium.

    Just a thought, anyway.
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