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## Homework Statement

Explain why the formula (dF/dV)=-P , where T and N are constant variables , makes intuitive sense, by discussing graphs of F vs. V with different slopes.

## Homework Equations

## The Attempt at a Solution

dF=SdT-PdV+mu*dN

dT and DN are zero since T and N are fixed.

As volume increases, P will be negative. as dV increase and P remains negative, then I suspect F will decrease therefore the slope dF/dV will be a negative value.