- #1

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_{A}occupy a volume VA at pressure P

_{A}, in equilibrium. The piston is expanded very slowly, turning the pressure in such a way that the product V⋅P

^{2}remains constant till the volume V

_{B}.

I have to evaluate the work in the transformation from A to B:

V

_{B}= 4 V

_{A}

P

_{A}and V

_{A}are known

w

_{AB}= ∫ P⋅dV =

My question is:

- Which value of Pressure shall I insert instead of P considering the fact that it isn't constant during the transformation?