The surface tension and vapour pressure of water at 20°C is 7.28 × 10⁻² N/m and 2.33 × 10³ Pa, respectively. What is the radius of the smallest spherical water droplet which can form without evaporating at 20°C?

Question

TextExcess Pressure Across a Curved Surface

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Assertion: The shape of a liquid drop is spherical. Reason: The pressure inside the drop is greater than that of outside.

Prove that excess pressure inside a soap bubble is inversely proportional to radius of bubble.

Excess Pressure Across a Curved Surface