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Q2. Give reasons for the following observation:

The smell of hot sizzling food reaches you several meters away, but to get the smell from cold food you have to go close.

Answer :

We know that for a particle to move it requires kinetic energy, and kinetic energy increases with increase in temperature. That why, the smell of hot sizzling food reaches you several meters away because it has high kinetic energy while to get the smell from cold food you have to go close.