\(\Delta \mathrm{Q}=\mathrm{W}=\text { area of } \mathrm{P}-\mathrm{V} \text { curve. }\)
\(=\pi \times\left(140 \times 10^3 \mathrm{~Pa}\right) \times\left(140 \times 10^{-6} \mathrm{~m}^3\right)\)
\(\Delta \mathrm{Q}=61.6 \mathrm{~J}\)
$(3^{1.4}=4.6555)$ [હવાને આદર્શ વાયુ લો]