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A very strange curve on P-V diagram

  1. Apr 26, 2017 #1
    Hi. For a state of nitrogen in which temperature is higher than the critical temperature the state is presented on a different curve. I do not remember any curve for superheated region.

    upload_2017-4-26_22-45-39.jpeg

    Source: Introduction to Engineering Thermodynamics by Sonntag/Borgnakke.
    Thank you.
     
  2. jcsd
  3. Apr 26, 2017 #2
    Is there a question here?
     
  4. Apr 27, 2017 #3
    Yes, what is that curve which point a stands on?
    Thank you.
     
  5. Apr 27, 2017 #4
    It's an isotherm, for a temperature above the critical temperature.
     
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