Give reason: a) Burning of kerosene does not produce much smell but when the burning ceases, it produces strong smell. b) Smell of hot food reaches faster then that of cold food.

Give reason: a) Burning of kerosene does not produce much smell but when the burning ceases, it produces strong smell. b) Smell of hot food reaches faster then that of cold food.
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Answer :

a) Burning of kerosene does not produce much smell but when the burning ceases, it produces strong smell. When kerosene is burnt, only few molecules diffuse with air after combustion. But when the burning ceases the unburnt hot vapours of kerosene enters into air and strong smell is got. b) Smell of hot food reaches faster then that of cold food. Smell of hot food reaches faster because rate of diffusion is faster. Cold food diffuses slowly.
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