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The work done in blowing a soap bubble of surface tension $0.06 \times \mathrm{Nm}^{-1}$ from $2 \mathrm{~cm}$ radius to $5 \mathrm{~cm}$ radius is
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$0.003168 \mathrm{~J}$
$\begin{aligned} \Delta \mathrm{W} &=\mathrm{S} \times \Delta \mathrm{A}=0.06 \times 4 \pi\left(\mathrm{r}_{2}^{2}-\mathrm{r}_{1}^{2}\right) \\ &=0.003168 \mathrm{~J} \end{aligned}$
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