Why can't you smell it perfume at a short distance when insense stick in not lighted?
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We can't smell it because it is in solid state and Solids have lowest rate of diffusibility.
When it is lighted it changes into vapour form and gases having highest diffusibility spread faster and hence we can smell it from long distance.
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_____________________________
We can't smell it because it is in solid state and Solids have lowest rate of diffusibility.
When it is lighted it changes into vapour form and gases having highest diffusibility spread faster and hence we can smell it from long distance.
______________________________
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