how can we smell perfume sitting several meters away from the source
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Due to diffusion the gaseous particles moves in all possible direction carrying the perfume particles with them, hence we can smell perfume sitting several meters away from the source.
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We can smell perfume sitting several meters away from the source because the perfume vapours diffuse into air.
Perfume is a very volatile liquid and "when liquid perfume is applied", it changes very quickly into vapours. These vapours move in all directions in the air and mix rate and because of this perfume can be smelled far away from the source. It contains some fragrance or pleasant smell which makes the moving molecules smell better.
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