After a hot sunny day, people sprinkle water on the roof-top because :
water helps air around the roof-top to absorb the heat instantly
water has lower specific heat capacity
water is easily available
water has large latent heat of vaporisation
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC CDS-1 – 2016
When water is sprinkled on a hot surface like a rooftop, it evaporates. Evaporation is a process that requires energy (heat). This energy is absorbed from the surroundings, including the rooftop itself and the air, as the water changes from liquid to gas phase. The latent heat of vaporisation is the amount of heat energy required to change a substance from a liquid to a gas at a constant temperature. Water has a relatively high latent heat of vaporisation, meaning it absorbs a significant amount of heat from the rooftop during evaporation, leading to a substantial cooling effect.