Question

The smell of hot sizzling food reaches you several metres away but to get the smell from cold food, you have to go close. Why

Answer 1

the kinetic energy is high in the hot particles .thus the rate of diffusion is also high.

but when a partical is cool the rate of diffusion is low hence we have to go closer to smell it

Answer 2

When food is hot, diffusion is more. But in cold food diffusion is slow. Hence to get the smell from cold food we have to go close.