In adiabatic expansion of a system in which its temperature changes from a value T₁ to T₂ the entropy will:

Explanation:

Adiabatic Process (Reversible)

During an adiabatic process as heat is neither supplied nor rejected,

dQ = 0

or \(\frac{dQ}{dT} = 0\)

or ds = 0

This shows that there is no change in entropy and hence it is known as the isentropic process,

Fig. represents an adiabatic process. It is a vertical line (1-2) and therefore area under this line is nil; hence heat supplied or rejected and entropy change is zero.