Question

The smell of hot sizzling food reaches us fron far away but for cold food we need to get close

Answer 1

This is done because as the temperature rises the rate of diffusion also increases . Hence , we can get the smell of a hot sizzling food though we are far away.
Hope this helps you.☺

Answer 2

the smell of hot sizzling food reaches us fast as they possesses faster kinetic energy but for cold food we need to get close bcoz its molecules don't possess that energy