Why dont smells really dissapear?

Question

....homework under "gases'....No smart a** answers plaese...

Answer 1

well to be honest "DISSAPPEAR" means "vanish" n you cant see smells. its a trick question id say.

peace bro.

Answer 2

I'm guessing it's because the molecules just disperse until the ratio of the 'smell molecules' is so small in comparison to the atmosphere molecules. And one 'smell' molecule on its own is undetectable to our noses.

Not written very scientifically but you get the idea.