\(W = \Delta U\) …..\((1)\)
\(W = -P \Delta U = -1(2 - 1) = -1 \,atm.litre\)
અને \({\Delta U} = n{C_v}(\Delta T) = 1 \times \frac{3}{2}R \times ({T_2} - {T_1}) = \frac{3}{2}R({T_2} - T)\)
સમીકરણ \((1)\) માથી
\( - 1 = \frac{3}{2}R({T_3} - T)\,\,\,\,{T_2} - T = - \frac{2}{{3R}}\)
\(\Rightarrow {T_2} = T - \frac{2}{{3R}}\)
\(\Rightarrow \left( {{T_2} = T - \frac{2}{{3 \times 0.082}}} \right)\)
(આપેલ : $\mathrm{R}=8.3 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$ )