Question

put an unlit incense stick in a corner of your class. how close do you have to go near it so as to get it smell. now Light the incense stick. what happens? do you get the smell is sitting at a distance?

Answer 1

yes we will get the smell of the incense stick because of the process od diffusion.
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i hope this will be helpful for u

Answer 2

1) we have to put it near our nose in case 1
2)smell flows in whole room and we can smell it from a far distance also
It all because of flow of air