Question

The smell of hot sizzling food reaches us even from a considerable distance but to get the smell from cold food we have to go close to it. explain the reason.

Answer 1

This is due to spontaneity depends upon the laws of thermodynamics .
The molecules move from the high temperature to area of the lower temperature .
This is reason why the hot sizzling food smell can be detected as the molecules get escape into atmosphere.

Answer 2

Because,the food particles of hot food can be easily fitted in the gaps of air ,whereas the food particles of cold food take much time to get fitted in the gaps.