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Van der waals gasby ja87
Tags: waals 
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#1
Dec1006, 12:34 PM

P: 2

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
Dec1006, 12:59 PM

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Sci Advisor
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P: 11,155

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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