The smell of hot sizzling food reaches you several meters away, but you have to go close to smell the cold food. What is the reason behind this?

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Solution

The kinetic energy of the particles increases with the increase in temperature.
Hot food increases the temperature of the air around it and hot air spreads faster and spreads more as compared to cold air.
Also, the particles of the hot sizzling food possess higher kinetic energy, they can diffuse rapidly and reaches us several meters away.
Since the particles of the cold food possess less kinetic energy, thus they are not able to reach several meters.

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