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Homework Help: Grain diameter

  1. Mar 12, 2008 #1
    The average grain diameter for a metal alloy was measured as a function of time at 650°C. The results are tabulated below:

    Time Grain diameter
    (min) (mm)
    30 3.9 x 10-2
    90 6.6 x 10-2

    Predict what the grain diameter would be (in mm) after 199 min at the same temperature if n=2.

    any ideA?
  2. jcsd
  3. Mar 12, 2008 #2


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    Science Advisor
    Homework Helper
    Gold Member

    Hi Sniperfx20, welcome to PF. Can you tell us what n is? It would also be helpful if you told us any equations that you've been given along with showing your attempt at the problem.
  4. Mar 13, 2008 #3


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    Staff Emeritus
    Science Advisor

    Looks like a grain growth problem. One has two sizes and two times, and one is trying to use a function. Is 'n' an exponent to a growth or diffusion equation? If so, then n=2 is a quadratic function.
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