Two bubbles of different radii are connected by a hollow tube, then:

Two bubbles of different radii are connected by a hollow tube then air flows from smaller bubble to bigger bubble and smaller bubble gets smaller and larger gets larger. Because the excess pressure inside the bubble is inversely proportional to the radius of bubble

i.e . $\mathrm{p} \mathrm{\alpha } \frac{1}{\mathrm{r}},\mathrm{r} \mathrm{being} \mathrm{the} \mathrm{radius} \mathrm{of} \mathrm{the} \mathrm{bubble}.$