When you get out of a swimming pool and stand dripping wet in a light breeze, yo

Question

When you get out of a swimming pool and stand dripping wet in a light breeze, you feel much colder than you feel after you dry off. Why is this? This is a purely psychological resulting from the way in which sensory nerves in the skin are stimulated. 540 cal of heat are required to evaporate each gram of water from your skin and most of this heat flows out of your body. Water has a relatively large heat capacity. The moisture on your skin has good thermal conductivity. The water on your skin is colder than the surrounding air.

Explanation / Answer

The answer is option b.

When you are standing in the light breeze, the water molecules get evaporated from your body. Now what is evaporation?

Evaporation is a type of vaporization of a liquid that occurs from the surface of a liquid into a gaseous phase. It does not depend on temperature. In fact when ever the environment to which the liquid surface is adjacent, is unsaturated, evaporation happens. Now every water nolecule needs some amount of heat to go to the gaseous state. The amount of heat is 540 cal/gm. Every gram of water absorbs this amount of heat from your body to go to gaseous state. That's why you feel colder.

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