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Gibbs phase rule at critical point

  1. Oct 27, 2014 #1
    What is the degrees of freedom at the critical point of a 1 component system such as water. in my test I put zero because the critical point is a POINT that is fixed per substance.
    is there any books that can back me up?
    I heard that my teacher said there was 1 degree of freedom which Im pretty sure its wrong
     
  2. jcsd
  3. Oct 27, 2014 #2
    and if im wrong what is your reasoning, thanks
     
  4. Oct 28, 2014 #3
    I agree with you. P + V = C +2
    C = 1
    P = 3
    so
    V = 0

    Chet
     
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