First slide

Surface tension and surface energy

Question

Two bubbles A and B (A > B) are joined through a narrow tube. Then

Moderate

A

The size of A will increase
B

The size of B will increase
C

The size of B will increase until the pressure equals
D

None of these

Solution

$r_{A} > r_{B} and P \propto \frac{1}{r} so P_{A} < P_{B}$
So air will flow from B to A i.e. size of A will increase.

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