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## Homework Statement

Hi!

I have this question "how is the curve of U(internal energy) with volume if the temperature is negative"?

## Homework Equations

## The Attempt at a Solution

i cnsidered T=(partial U/partial S) at constant V and N (number of particules, but now i can't say the change of U with V if T<0...can somebody help me?

i also thought that T = slope of the tangent line to the function U(S) but i can't say how is the curve U(V) when T<0 as required

(note: i know the temperature can't be negative but we want to know what theoricaly happens)

thanks!