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Discussion :: Chemical Engineering Thermodynamics

  1. PVγ = Constant (where, γ = Cp/Cv) is valid for a/an __________ process.

    2. A.

     Isothermal
    B.

     Isentropic
    C.

     Isobaric
    D.

     Adiabatic

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    Answer : Option D

    Explanation :

    For an adiabatic process, by first law of thermodynamics for an ideal gas under adiabatic conditions we can write :

    CVdT=−PdV⇒CVdT=−RTV(dV)⇒dTT=−RCVdVV⇒TVγ−1=CONSTANTOr,PVγ=CONSTANT
    (Note : this equation can only be used for ideal gas and when the heat capacities are remaining constant)

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