Van der waals gas

  1. i have to plot isotherms using the van der waals gas theory. i am using Maple to do this but no matter how many differant equations i use i cannot get the graphs to look right. it should look like a 1/x curve but with a sharpe trough in it, but all can get is a graph that looks like a normal 1/x curve. does anyone know the equation i should use to give me the curve of pressure against volume for differant values of temperature.
  2. jcsd
  3. Gokul43201

    Gokul43201 11,044
    Staff Emeritus
    Science Advisor
    Gold Member

    1. Henceforth, post such questions in the Homework & Coursework subforums.
    2. Write down the equation you are using to plot the isotherms
    3. What values have you assigned to the coefficients, b and a?
    4. You may simply be looking at the isotherms above the critical temperature. Have you chosen values of T that are very small?
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