An ideal gas mixture filled inside a balloon expands according to the relation $PV^{2/3} =$ constant. The temperature inside the balloon is
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$\mathrm{PV}^{2 / 3}=\mathrm{const}$
$\Rightarrow \frac{n R T}{V} v^{2 /3}=$ const.
$\Rightarrow T V^{-1 / 3}=$ const.
$\Rightarrow T=$ conts. $\times V^{1 / 3}$
$\therefore$ On increasing volume, temperature increase
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