why does the smell of the lighted incense stick reaches several metres away?

The smell of the lighted incense stick reaches several metres away due to diffusion.On heating, the movement of particles of incense stick increases and they move from a region of their higher concentration to a region of their low concentration thereby intermixes with other particles of air thus the smell reaches several metres away.

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As the temperature increase, the kinetic energy of the matter increases and hence there will be more diffusion. So, when the incense sticks are lighted, the particles of the matter of smell diffuses with the particles of air and they reach us.

Thumbs up please if it helps....

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