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

bcoz in hot food there is high temperature which leads the evolution of kinetic energy which makes the particles of food to move and diffuse in air. .....and those particles reaches our nose

Answer 2

Smell of hot food reaches us several meters away because of process of diffusion the molecules expand and spread far apart when heated.