Q44 of 160 Page 19

Explain how, the smell of food being cooked in the kitchen reaches us even from a considerable distance.

The particles of the aroma of hot cooked food mix with the particles of air spread from the kitchen, reach us and even farther away, in seconds. Due to high speed of particles and large space between them, gases show the property of diffusing very fast into other gases. Hence diffusion is the process which brings smell to us.


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(a) What does the diffusion of gases tell us about their particles?

(b) Give one example of diffusion of gases in a liquid.

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Give reason for the following observation:

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