Question

people sprinkle water on the roof or open ground after a hot sunny day.give reasons

Answer 1

We know that evaporation causes cooling because of latent heat of vaporization.

So when water is sprinkled on the hot roof or an open ground after a hot sunny day,it evaporates,thus decreasing the temperature of the surroundings.

Answer 2

The specific heat capacity of water is high.

This means that the heat energy required to increase the water temperature by 1℃ (degree Celsius) is very high. Thus, on a very hot and sunny day, the sprinkling of water on roofs and gates is helpful in cooling the surface.

The heat from the surface of the roofs and gates is used up by the water to heat up and evaporate, which in turn cools the surface it was sprinkled on.