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Homework Statement
Sketch the following compressibility isotherms(fancy word for graphs) (compressibility factor, PV/nRT versus pressure
:) for oxygen at a temperature just above the critical temperature
::) for oxygen at a temperature well above the critical temperature eg. 200 degrees.
Label all isotherms and explain the differences, if any, between the curves.
Homework Equations
The Attempt at a Solution
Well I thought that both graphs will start at 1, and will have a positive gradient, because of the molecular volume effect. The graph won't dip like it would if oxygen was below critical temperature, because at critical point the species will be moving too fast for the intermolecular forces to have effect. But what I'm not sure if the gradient of the curve for part :) will be higher than for part ::) because as temperature increases, PV/nRT will drop no?