For an isothermal expansion of a perfect gas, the value of $\frac{{\Delta P}}{P}$ is equal
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(b)Differentiate $PV = $constant w.r.t $V$
==> $P\Delta V + V\Delta P = 0$==> $\frac{{\Delta P}}{P} = - \frac{{\Delta V}}{V}$
==> $P\Delta V + V\Delta P = 0$==> $\frac{{\Delta P}}{P} = - \frac{{\Delta V}}{V}$
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