van der waals gas


by ja87
Tags: waals
ja87
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#1
Dec10-06, 12:34 PM
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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.
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Gokul43201
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#2
Dec10-06, 12:59 PM
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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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