Mathematical definition of critical point?(thermodynamics)

  1. 1. The problem statement, all variables and given/known data
    If a gas is described by Van der Waals eqn (p+a/v^2)(v-b)=kT, find the critical pint p_c, T_c,and v_c

    2. Relevant equations

    3. The attempt at a solution
    Actually this is just one intermediate step I got stuck for my stat mech homework, I don't even know the mathematical definition for critical point(I didn't learn quite well in my thermodynamics course), the only relevant equation I found is in wiki, but I don't think it is adequate for my problem.
  2. jcsd
  3. Em.. sorry, I made a silly mistake in my mind, equations given in wiki should be adequate for my problem.
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