Question

how can we smell perfume sitting several meters away from the source

Answer 1

The gas particles move randomly about, diffusing into surrounding air in the room, becoming more dilute as they spread out. 

Answer 2

The perfume molecules spread out or 'diffuse' through the air. The smell becomes less concentrated but it reaches a great distance - meaning you can smell it from relatively far away. When a perfume is sprayed several metres away from the source, the particles of the perfume diffuses with the particles of the gas.

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Alplali
Ace