Previous year MCQs

General science UPPSC 1995 GS-I
Question

Pressure inside a soap bubble is:

Answer & Solution

Answer: (Detailed Solution Below)

Option A: More than atmospheric pressure

Detailed Solution:

The correct answer is “More than atmospheric pressure”.
The pressure inside a soap bubble is actually greater than the atmospheric pressure.

This excess pressure is due to the surface tension of the soap film. The spherical shape of the bubble is maintained by the balance of the internal pressure and the surface tension.

Surface tension is the tendency of liquid surfaces at rest to shrink into the minimum surface area possible. Surface tension is what allows objects with a higher density than water such as razor blades and insects to float on a water surface without becoming even partly submerged.

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