Adiabatic Process - Practice Questions & MCQ

Adiabatic Reversible Expansion of An Ideal Gas

(1) Process Equations for Reversible Adiabatic Process

As in an adiabatic change, there is no transfer of heat that is, q = 0 or dq = 0.

W can be written as 

Alternatively, the Work can also be derived by the formula

(2)Irreversible Adiabatic Process

The process equations mentioned above for the Reversible Adiabatic Process do not hold for the Irreversible Adiabatic Process.

However, the First law of Thermodynamics and the Ideal Gas equation hold true for the Irreversible Adiabatic Process and the work can be calculated using the Equation (1) as given above

(3)Irreversible Adiabatic Free Expansion

In a free expansion, the expansion is carried out against Vacuum in an isolated container. Thus, the value of external pressure is zero so work done is zero and also Q is zero as the system is Isolated ( Adiabatic).

Thus, it can be said that

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Comparison between Isothermal and Adiabatic Curves