Home Physics Surface Tension Excess Pressure in Drops ans Bubble If two soap bubbles of different radii are c…
Physics Surface Tension Excess Pressure in Drops ans Bubble MCQ (Single Correct)

If two soap bubbles of different radii are connected by a tube:

A
air flows from the bigger bubble to the smaller bubble till the sizes become equal
B
air flows from bigger bubble to the smaller bubble till the sizes are interchanged
C
air flows from the smaller bubble to the bigger
D
there is no flow of air

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Text Solution

Verified by Experts
The correct answer is:
C

The excess pressure inside the soap bubble in inversely proportional to radius of soap bubble

i.e. P e ∝ 1/r, r being the radius of bubble. It follows that pressure inside a smaller bubble is greater than that inside a bigger bubble. Thus, if these two bubbles are connected by a tube, air will flow from smaller bubble to bigger bubble and the bigger bubble grows at the expense of the smaller one.

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