Question

Give reasons for the following observations.

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

Answer 1

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

• Particles of matter move continuously. At low temperatures their kinetic energy is low but as we apply heat the kinetic energy increases.
• The particles present in hot sizzling food possess greater energy in the form of kinetic energy and show diffusion at a greater speed.
• Particles of cold food do not have kinetic energy so doesn't show diffusion and hence we have to go close.