- #1

phantomvommand

- 241

- 37

Hi guys,

We have this very common graph where pV deviates from ideality.

May I know the equation for such a curve?

Secondly, if the x-axis were changed to V, what would the graph look like?

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- Thread starter phantomvommand
- Start date

- #1

phantomvommand

- 241

- 37

Hi guys,

We have this very common graph where pV deviates from ideality.

May I know the equation for such a curve?

Secondly, if the x-axis were changed to V, what would the graph look like?

- #2

BvU

Science Advisor

Homework Helper

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- #3

Chestermiller

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The vertical axis is labelled incorrectly. It should read $$\frac{PV}{RT}$$where V is the molar volume. This is called the compressibility factor Z. According to the Principle of Corresponding States, Z is a function of the reduced pressure ##P/P_C##, the reduced temperature ##T/T_C##, and the ascentric factor ##\omega##, where the subscript C indicates the value at the critical point and where ##\omega## varies with the specific gas. Graphs of Z as a function of reduced temperature, reduced pressure, and ascentric factor can be found in most thermo books.View attachment 290237

Hi guys,

We have this very common graph where pV deviates from ideality.

May I know the equation for such a curve?

Secondly, if the x-axis were changed to V, what would the graph look like?

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