First law when expressed in terms of entropy takes the form_____(a) T ds = de – p dv(b) T ds = dh – p dv(c) T ds = de + p dv(d) T ds = dh + p dvThis question was addressed to me by my school teacher while I was bunking the class.The doubt is from A Brief Review of Thermodynamics topic in portion Compressible Flow – Preliminary Aspects of Aerodynamics

First law when expressed in terms of entropy takes the form_____(a) T

1.	First law when expressed in terms of entropy takes the form_____(a) T ds = de – p dv(b) T ds = dh – p dv(c) T ds = de + p dv(d) T ds = dh + p dvThis question was addressed to me by my school teacher while I was bunking the class.The doubt is from A Brief Review of Thermodynamics topic in portion Compressible Flow – Preliminary Aspects of Aerodynamics
Answer» The correct answer is (C) T ds = DE + p dv The explanation: The first law of thermodynamics when expressed in terms of entropy gives us two alternate equations. These equations are T ds = de + p dv and T ds = dh – V dp. We have USED the relation of heat and entropy in the first law EQUATION to get these equations.

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