Question

Why does the fan which does not cool the air of the room, has a cooling effect on our body?

• A. Air movements over the body helps speed up the evaporation of sweat.
• B. Air movements over the body causes loss of heat from the body.
• C. Air movements reduce the blood supply to the skin.
• D. Air movements reduce the sweat secreted by the sweat gland.

Answer 1

The correct option is A Air movements over the body helps speed up the evaporation of sweat.

Air movements over the body helps speed up the evaporation of sweat. Evaporation of sweat has a cooling effect on the body because water takes heat from the surrounding atmosphere and changes to vapour state.