Question

Why it is that smell cold food,we have to go close but the smell of hot food reaches us several merter away

Answer 1

When the food is hot the molecules inside it are free having more space between each other and that's why it combines with air particles and smell of all food spreads in more area than cold good.

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.