Question

what role does latent heat of vaporisation play in keeping our body cool??

Answer 1

 the heat of our skin transformed the sweat into water vapor taking heat away from our body. This is called adiabatic cooling since the system is closed and changes in the state of the water are affected without loss or gain of heat. The heat is now locked in the air as humidity (water vapor) without changing the temperature of the air. When the the heat is released, (like when the humid air touches a cold air mass) the water vapor condenses back into a liquid.

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