On a P-V diagram, if the pressure stays constant and the volume

[P-Jay1]

On a P-V diagram, if the pressure stays constant and the volume increases, what happens to the temperature?

Does it increase, decrease, or stay the same?

 

[LawrenceC]

Assuming an ideal gas you can look at polytropic relations where P*V**n = constant.

This leads to T2/T1 = (V1/V2)**(n-1)

What do you know about n for an isobaric process?