Question

we can incence stick lit in other room but cannot smell cold drink placed in dining room why

Answer 1

We can smell incense stick lit in other room but cannot smell cold drink placed in dining room because heat provides more kinetic energy that helps us to smell it.
Hope it helps

Answer 2

We know that diffusion increases with increase in rate of Diffusion.As incense stick has more kinetic energy than cold food that's why we can smell incense atick in other room but cant smell cold drink placed in dinning room