
#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

Emeritus
Sci Advisor
PF Gold
P: 11,154

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? 


Register to reply 
Related Discussions  
MATLAB & Van der Waals  Math & Science Software  6  
Van Der Waals forces  Biology, Chemistry & Other Homework  3  
van der Waals' forces  Chemistry  2  
van der waals gas  Advanced Physics Homework  0  
van der waals  Advanced Physics Homework  0 