1. The problem statement, all variables and given/known data 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. 2. Relevant equations 3. 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.