The surface tension and vapour pressure of water at 20°C is 7.28×10-2 Nm-1 and 2.33×103 Pa, respectively. What is the radius of the smallest spherical water droplet which can form without evaporating at 20°C?
The surface tension and vapour pressure of water at 20°C is 7.28×10-2 Nm-1 and 2.33×103 Pa, respectively. What is the radius of the smallest spherical water droplet which can form without evaporating at 20°C?
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1 Answer
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This is a short answer type question as classified in NCERT Exemplar
Surface tension of water S= 7.28×10-2 Nm-1
Vapour pressure p= 2.33×103 Pa
The drop will evaporate, if the water pressure is greater than the vapour pressure.
Let a water droplet or radius R can be formed without evaporating.
Vapour pressure= Excess pressure in drop.
P=2S/R
R= 2S/P=
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