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Diffusion -- What is average distance travelled?

  1. Aug 21, 2014 #1
    1. The problem statement, all variables and given/known data

    Would appreciate any help quite confused on this topic.
    If a type of ion has a diffusion coefficient of 10^-8 m^2/s in water. What is average distance travelled after 30 mins?

    What sort of graph should you plot in order to easily test validity of r=squarer root-2Dt. How will value of diffusion constant be obtained from such a graph?

    2. Relevant equations

    √x=√2Dt

    3. The attempt at a solution

    I've tried to transpose th equation and failed at transferring the correct units. also I don't know how to visualize it as a graph.

    thanks
     
  2. jcsd
  3. Aug 21, 2014 #2
    This is the same thing as finding the center of mass. So what is your equation for determining the center of mass?

    Chet
     
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