Multiple choice

Which of the following options helps in cooling a hot surface when we sprinkle water on it?

  1. Latent heat of fusion

  2. Latent heat of sublimation

  3. Latent heat of vaporisation

  4. Latent heat of precipitation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

People sprinkle water on the roof or a hot surface because the large latent heat of vaporisation of water helps cool the hot surface.  Latent heat of fusion is the amount of heat energy required to convert 1 kg of solid into liquid at its melting point. Sublimation is the phenomenon of direct conversion of a solid into the gaseous state on heating and vice-versa on cooling without passing through the intervening liquid state. Precipitation involves formation of insoluble products. Thus, these options are incorrect.

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