First slide

Different type of processes

Question

For an adiabatic expansion of a perfect gas the value of $∆ P / P$ is equal to:

Easy

A

$\frac{∆ V}{V}$
B

$γ \frac{∆ V}{V}$
C

$- γ \frac{∆ V}{V}$
D

$- γ^{2} \frac{∆ V}{V}$

Solution

$P V^{γ} = C O N S T A N T P α V^{γ} P α V^{- γ} \frac{∆ P}{P} = - γ \frac{∆ V}{V}$

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