6. (a) Write down an expression for the volume difference dV between two equilibrium states in which the temperature and pressure differ by dT and dP respectively, T and P being independent. (b) Write down a similar expression for the pressure difference dP between two equilibrium states in which T and V are independent. (c) Proceed to show that the partial derivatives are related by: av ӘР == (-), (²), ()₁ = -1
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