Why does temperature in thermometer decreases when the bulb is covered with a piece of cloth soaked in spirit?

Answer 1

The spirit has the property of absorbing heat very fast. It even has a very less boiling point. Hence, the spirit absorbs heat quickly and evaporates even at normal temperature.(that may explain as to why it is stored in air tight containers). Now, because it has absorbed energy, the object on which it had been applied gets cooled according to the energy conservation law and as it has evaporated away, it leaves the object cooler.
thus the mercury falls down in the thermometer when its bulb is wrapped in a spirit soaked cloth.
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Answer 2

This is a good example of the phenomenon called the latent heat of evaporation. It is the operating principal used in refrigeration equipment and air conditioners.
For example, when you put a pot of water on the stove and let it boil, the temperature of the water will never exceed 212 degrees, despite the fact that the burner stays on and is obviously adding more heat to the water - the "extra" heat from the burner is absorbed by the steam and, later, given off when the water condenses.

In your example, the evaporation of the spirit absorbs some of the heat from the thermometer in the same way - only at a much different temperature than water.

Refrigerant gasses "boil" at very low temperatures, thus absorbing the heat from the air (air conditioner) or objects (refrigerator). This latent heat that is absorbed is then given off when the gas condenses back into a liquid - that is why the coils on the back of your refrigerator (condenser) get very warm to the touch during operation.

Answer 3

It's called evaporative cooling, it's the same reason you cool down when you sweat or your clothes get wet. In order for water to evaporate it requires heat/energy to turn into gas, when it does this it evaporates and takes the heat with it, cooling down the surface.

Answer 4

The spirits evaporate take heat with it.

Answer 5

spirit evaporates causing cooling which decreases temprature and hence level of mercury falls same is case with ether or perfume applied on hand causes cooling.

Answer 6

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Answer 7

Because methylated spirit cools the surrounding area when it evaporates.

Answer 8

Evaporative cooling.