A friend asks me this. If considering the equation: [itex]∫\frac{dQ}{T}[/itex], then it is technically feasible to work out some forms of expressions with measurable physical quantities like temperature and specific heat, therefore it is possible to work out a precise value for entropy change. But is there a more economic way? I think Claussius entropy is too phenomenological to be directly observed in experiments, and the Boltzmann definition is not suitable for experiments.(adsbygoogle = window.adsbygoogle || []).push({});

While above is about the entropy change, my friend also asks how to determine the entropy of a system, for example a tank of CO2. If a perfect crystal has zero entropy, does that meran in order to calculate the entropy we have to construct possible quasi-static processes from perfect crystals to the present compound and work out the entropy change, which seems to be very uneconomic?

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# How can we measure entropy using experiments.

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