Question

why can we sense the smell of lighted incense stick from a distance but to sense the smell of unlit incense stick we will have to go near why?????????????????

Answer 1

Particles of matter are continuously moving. Rate of movement of particles increases with temperature; therefore the smell of lighted incense stick reaches us several metres away due to diffusion.

Unlit incense stick is solid in state.In solids, molecules are very closely packed, so practically no movement occurs there. It is a rigid body... Thus, the rate of diffusion is the least in solids. Therefore, one can smell unlit incense stick only when we are close to it.

Answer 2

difference of burning incense stick spread all around due to the diffusion of a smoke into the air. the particle of gases produced by the burning of incense stick move rapidly in all direction they collide with a particle of a present in the room mix with the air and reach every part of room very quickly.....may it helps u.....thank you