Question

why do we sprinkle water on roof or open ground in summer?

Answer 1

To keep it cool simple
As the water will evaporate then it will take the heat because water has the highest heat capacity

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.......