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GK QUESTION#2932

After a very hot day, people often sprinkle water on rooftops or open courtyards. What is the main scientific reason behind this practice?

  1. ATo increase the temperature of the surface
  2. BTo reduce dust particles present on the ground
  3. CTo make use of the high latent heat of vaporisation of water for coolingCorrect answer
  4. DTo make the ground moist and slippery
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Answer

C. To make use of the high latent heat of vaporisation of water for cooling

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Explanation

Evaporating water takes latent heat from the wet surface and its surroundings. This removes energy from a hot roof or courtyard and cools it; evaporation can occur below the boiling point.

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