Question

Why do we get hot food smell from a distance but not cold food why?

Answer 1

When food is sizzling hot,it releases the vapours of it contents.Since the kinetic energy of the particles is very high in the case of vapour state,these particles readily mix up with the particles of air. They can reach us even at a distance of several metres.However,when the food is cold the vapour released will be comparatively less.Kinetic energy is also very stop.Under these conditions,one has to come quite close in order to smell the contents of the 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.