Question

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

Answer 1

‘Hot food’ reaches us ‘several meters’ away due to the temperature diffused to high to low.

Explanation:

• Due to diffusion property of matter smell of “hot sizzling” food several meters. Diffusion is the intermixing of “two different types of matter” their own.  

• The diffusion of matter increases the increase the temperature. The diffusion rate of matter becomes faster and the smell of “hot sizzling food” reaches us ‘several meters’ away.
• The rate of diffuse is slower at low temperature hence, the smell of cold food reaches slowly.

Answer 2

When food is hot, diffusion is more. But in cold food diffusion is slow. Hence to get the smell from cold food we have to go close.