Concept:Evaporation causes cooling because water absorbs latent heat of vaporization from the skin to change into vapour.
Explanation:When water is applied on the skin, it evaporates, changing from the liquid state to the gaseous state.
This change of state requires energy, known as the latent heat of vaporization.
The evaporating water molecules absorb this heat from the skin surface.
As heat is continuously removed from the skin, its temperature drops, producing a cooling sensation.
In summer, the rate of evaporation is higher due to increased temperature and lower humidity, giving greater relief.
Condensation is the opposite process; it releases heat (exothermic) and would make the skin feel warmer, not cooler.
Sweating is the body's natural thermoregulation mechanism that uses evaporation to maintain a stable internal temperature.
Earthen pots keep water cool because water seeps through microscopic pores and evaporates from the outer surface, absorbing heat from the water inside.
Cotton clothes are recommended in summer because they absorb sweat and expose it to air for rapid evaporation.
Answer:Option A: Evaporation of water absorbs heat from the skin surface.