1. We get the smell of perfumes while we are sitting several meters away . Give reason why is it so ?

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Solution

We get the smell of perfumes sitting several meters away due to diffusion . Vapours of perfume move rapidly in all direction and spread in the air by diffusion . when perfume vapours reach several meters away we can get the smell of perfumes .

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We can get the smell of perfume sitting several meters away.

(a)

(b)

Give reason for the following observations.

(a) Naphthalene balls disappear with time without leaving any solid.

(b) We can get the smell of perfume sitting several metres away.

We can get the smell of perfume sitting several meters away, why?

Give reason for the following observation :

We can get the smell of perfume sitting several meters away.

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