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Surface Tension

Which of the ...

Question

Which of the following property of water can be used to explain the spherical shape of rain droplets?

(a) Viscosity (b) Surface tension

(c) Critical phenomena (d) Pressure

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Solution

Answer: (b) Surface tension

The spherical shape of rain droplets is due to surface tension. The lowest energy state of a liquid will be when the surface area is minimum. Surface tension tries to decrease the surface area of the liquid to the minimum. The rain droplets are spherical because for a given volume, a sphere has minimum surface area.

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