Q55 of 160 Page 36

How will you demonstrate that water vapour is present in air?

The presence of water vapor in air can be shown by the following experiment:

Let us take some ice-cold water in a tumbler. Soon we will see water droplets on the outer surface of tumbler. The water vapor present in air, on coming in contact with the cold glass of water, loses energy and gets converted to liquid state, which we see as water droplets.


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(a) Define the term ‘latent heat of fusion’ of a solid. How much is the latent heat of fusion of ice?

(b) Draw a labeled diagram of the experimental set-up to study the latent heat of fusion of ice.

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(a) Define the term ‘latent heat of vaporization’ of liquid. What is the value of the of the latent heat of vaporization of water?

(b) Draw a labeled diagram of the experimental set-up to study the latent heat of vaporization of water.