First slide

Surface tension and surface energy

Question

The adjoining diagram shows three soap bubbles A, B and C prepared by blowing the capillary tube fitted with stop cocks, S₁, S₂ and S₃. With stop cock S closed and stop cocks S₁, S₂ and S₃ opened

Moderate

A

B will start collapsing with volumes of A and C increasing
B

C will start collapsing with volumes of A and B increasing
C

C and A both will start collapsing with the volume of B increasing
D

Volumes of A, B and C will become equal at equilibrium

Solution

Excess pressure inside soap bubble is inversely proportional to the radius of bubble i.e. $Δ P \propto \frac{1}{r}$
This means that bubbles A and C posses greater pressure inside it than B. So the air will move from A and C towards B.

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