What would the curve that describes the change of internal energy (U) with the volume (V) be like if the change in the temperature is negative?
My try:
For a ideal monoatomic gas, we have U=(3/2)NkT, where N=number of particles and k=boltzmann constant. So U=(3/2)pV
M question is: If the pressure changes, how is it possible to describe U as a function of V?
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