Give reasons for the following observation: The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close.

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Solution

Particles of hot sizzling food possess large kinetic energy and diffuse in air rapidly and reach several metres away whereas particles of cold food possess less kinetic energy and are not able to reach several metres away.
Particles of matter possess kinetic energy and keep moving constantly. At lower temperature, particles have low kinetic energy and thus move slowly. Particles in cold food have low kinetic energy due to low temperature. At higher temperature, particles have high kinetic energy and move faster hence, the particles of hot vapors from hot food move faster.

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