Question

why can we smell hot food from a distance but to smell cold food we have to go near it?

Answer 1

the smell of hot food reaches us by the process of diffusion of gases into the air The rate if diffusion of hot gases into air is faster than the cold gases so, the smell of hit sizzling food reaches us quickly even when. we are several metres away because the rate of diffusion of hot gases us much faster than the rate of diffusion of cold gases release by the cold food

Answer 2

When molecules of some volatile substances from hot sizzling food diffuse into air and reach the odur sensitive part of our nose we have the perception of smell.

At higher temperature of molecules diffuse into air at a faster rate and therefore travel long distances.

Hence the smell of hot sizzling food reaches as quickly even when we are several metres away.

While on the contrary , when the food is called the vapour diffuse is at a slower rate and therefore does not travel longer distances.

So, one has to come closer to have the perception of smell.