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Explain why it is easy to measure the derivative of the volume of a system with...

Explain why it is easy to measure the derivative of the volume of a system with respect to its entropy, when the system is maintained at constant energy? [use words, not equations, so your answer is understandable to your non-scientist friends]

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Answer #1

Internal energy of a system comprising of all the energies associated with a particular system but not the kinetic energy generated by the moelcules is not directly measured. Instead it is measured in terms of other extrinsic variable or property such as entropy. Now when the system has a constant energy such that no heat is lost or gained from the surrounding, the change in volume can be easily measured. The volume change upon expansion or compression which is represented as derrivative of final volume to initial volume is measured for the total entropy change for the system without the work term included. This is according to the first law of thermodynamics.

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