Question

A soap bubble of radius R is surrounded by another soap bubble of radius 2R, as shown. Take surface tension = S. The pressure inside the smaller soap bubble, in excess of the atmospheric pressure is $\frac{nS}{R}$, then find the value of n.

Answer 1

Pressure at A =$P_o+\frac{4S}{2R}$
Pressure at B =$P_o+\frac{4S}{2R}+\frac{4S}{R}=P_o+\frac{6S}{R}$