Question

it is seen that people get comfort when they sprinkle water on the roof or open ground after a hot sunny day. why?

Answer 1

Because the large latent heat of vaporisation of water helps to cool the hot surface

Answer 2

Here is your answer
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During the hot summer ,

water evaporates by absorbing heat from the ground and the surrounding Air. By losing heat, the ground becomes cool and people feel comfortable .

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Hope this helps you.......