Question

.Why do we sprinkle water on the roof or open ground in summer?

Answer 1

When water is sprinkled on the roof top or ground it evaporates because of the latent heat of vaporisation leaving behind a cooling effect. in case of ground, this evaporation causes cooling of the surrounding area after some time; whereas in case of roof top the room beneath is cooled.

Answer 2

So that the water put on the hot floor absorbs latent heat of vaporisation to make it cool..