Question

give reasons for the following observation the smell of hot sizzling food reaches you several metres away but to get the smell from cold food you have to go close

Answer 1

The vapours arising from hot food has greater energy as hot food has more heat than cold food. So diffusion occurs faster and smell reaches oir nose fastly.

In case of cold food, it has small amount of heat and thus diffusion is at slower rate and hence we hav to go close to smell it.

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.