Question

How do we detect the smell of an agarbatti (incense stick)?

Answer 1

Because when the incense stick is lighted, it diffuse in the air. We know that the Air transports all the smells....And when the stick is lighted it diffuse into the air. The molecules of air are loosely packed so that they roam. The air moves from one place to another. When the smell reaches your nose, it detects it.

Answer 2

Answer:

Smell of an agarbatti is detected by Nose, olfactory receptors present in the nose sends electrical signal to the fore brain. Fore brain interprets this signal as the incense stick to be detected as smell.