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Question

During the evaporation of a liquid –


  1. The temperature of the liquid will rise.

  2. The temperature of the liquid will fall.

  3. May rise or fall depending on the nature.

  4. The temperature remains unaffected.


Solution

The correct option is B

The temperature of the liquid will fall.


Evaporation is the process where some molecules of a liquid at the surface are able to break away from the surrounding liquid molecules. This means that it becomes a gas. 

Now breaking free requires some energy. Just like you need to use a lot of energy to break a brick. When a molecule at the surface gains enough energy it breaks away. Where does this energy come from? 

It comes from the liquid itself! When this molecule breaks away, the liquid as a whole loses some energy. This is why we see that the temperature drops. 

Note: Clay pots and coolers work on this principle. 

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