In an adiabatic expansion of an ideal gas the product of pressure and volume is

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First increase and then decrease

Decreases

Increases

Remain constant

answer is A.

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Detailed Solution

${pv}^{γ} = constant \Rightarrow {PV}^{1} \cdot v^{γ - 1} = k \Rightarrow PV = \frac{k}{V^{γ - 1}} If ' V' increases, V^{γ - 1} increases, product PV decreases .$

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