Question

Give reasons for the following.
The bulb of the wet bulb thermometer is always wrapped in a piece of wet cotton cloth.​

Answer 1

Answer:

A thermometer left naked and exposed to the air will measure the ambient temperature. If you wrap the bulb of the thermometer in wet cloth, by contrast, the evaporating water from the wet cloth will cool the thermometer down, and its temperature will be cooler than it would be otherwise.

Explanation:

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Answer 2

A wet bulb thermometer is simply a regular mercury thermometer whose bulb is covered with wet fabric, usually muslin, that is dipped in a reservoir to keep it wet. Why would you need one of these? The answer is that a wet bulb thermometer, when used in conjunction with a dry bulb thermometer (which is simply a regular thermometer without the wet fabric covering), gives you a way to measure the relative humidity of the air. The difference between wet bulb temperature and the dry bulb temperature depends on how much moisture is in the air.