Question

Give Reasons for the following observations: 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

Because the vapours that arise from hot food are warm and thereby lighter,so they rise up and through diffusion with the air surrounding it ,it travels through far places.

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.