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Question

In a thermodynamic system entropy ϕ is defined as ............. where dh is heat added, p and T are pressure and temperature.

This question was previously asked in
MH SET 2020 Paper 2 Philosophy Question Paper (27-Dec-2020)
The correct answer is

dh/T

Entropy is a thermodynamic state function that measures the degree of disorder of a system and the unavailability of its energy for work.

For a reversible process, the change in entropy equals the heat added divided by the absolute temperature at which it is added: dϕ = dh/T.

This relation, from the second law of thermodynamics, is used in meteorology to define potential temperature and to study adiabatic and diabatic processes.

Dividing heat by pressure, by the square of temperature, or by the product of pressure and temperature does not give the defined entropy change.

Hence, dh/T.

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