(i) When two bubbles of different sizes are in communication with each other, air passes from smaller one to larger one and larger one grows at the expense of smaller one. This happens due to pressure inside the smaller bubble being higher than that inside the larger bubble.
(ii) If two soap bubbles of different radii r1 and r2 (r1 > r2)coalesce to form a single double bubble having a common surface, then the radius of curvature of the interface is given by r = r1r2/(r1 – r2)
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