Two soap bubbles of radii a and b coalesce to form a single bubble of radius c if the external - Physics - Mechanical Properties of Fluids

Question

Two soap bubbles of radii a and
b coalesce to form a single bubble of
radius c if the external pressure is P
then srface tension of the soap solution is ?

Akansha Tyagi · Accepted Answer

(P+4σa)43πa3+(P+4σb)43πb3=(P+4σc)43πc3p[a3+b3+c3]=4σ[c3-a3-b3]σ=P[c3-a3-b3]4[a2+b2+c2]

Two soap bubbles of radii a and b coalesce to form a single bubble of radius c if the external pressure is P then srface tension of the soap solution is ?