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Homework Help: Proving coefficient of volume expansion

  1. Feb 17, 2008 #1
    1. The problem statement, all variables and given/known data
    Prove the equation B=3A, where B is the coefficient of volume expansion and A is the coefficient of linear expansion, considering a cube of side 's' and therefore volume V=s^3 that undergoes a small temperature change 'dT' and corresponding length and volume changes 'ds' and 'dV'.

    2. Relevant equations

    3. The attempt at a solution
    I think I need to prove the coefficient of linear expansion, then prove the coefficient of volume expansion and observe the relationship between the two. I don't know where to start though, or if there is a more straight forward way. any help is appreciated, thanks
  2. jcsd
  3. Feb 17, 2008 #2
    I was thinking of using the ideal gas law:

    but ITS NOT A GAS. I'm lost
  4. Feb 17, 2008 #3
    Are you sure that you don't just need to show that if the coefficient of linear expansion is A then the coefficient of volume of expansion is just 3A?

    I feel that this is more likely the question being asked.
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