Why do people sprinkle water on roofs or open ground after a hot sunny day?
Show answer & explanation
Correct answer: C
Explanation
Correct Answer: Option 3 (Using the large latent heat of vaporization of water for cooling.)
Explanation:
When water is sprinkled on roads or open ground on hot days, it evaporates. In the process of evaporation, water absorbs heat (latent heat) from its surroundings, reducing the surrounding temperature and causing a feeling of coolness.
Additional Facts:
Evaporation is an endothermic process.
Sweating cools the body on this principle.
Coolers and earthen pots (matkas) also work on the principle of evaporation.
Possible questions for the upcoming exam:
What happens to heat during evaporation?
(Answer: Absorption)
How does sweat cool the body?
(Answer: Evaporation)
On what principle does a cooler work?
(Answer: Evaporation)