NCERT Solution for Class 9 Science Chapter 1
Matter in Our Surroundings
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-3
Questions No-2
The smell of hot sizzling food reaches you several meters away, but to get the smell from cold food you have to go close.
Solids diffuse at a very slow rate. But, if the temperature of the solid is increased, then the rate of diffusion of the solid particles into air increases. This is due to an increase in the kinetic energy of solid particles. Hence, the smell of hot sizzling food reaches us even at a distance, but to get the smell from cold food we have to go close.
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The smell of hot sizzling food reaches severed meters away, as the particles of hot food have more kinetic energy and hence the rate of diffusion is more than the particles of cold food.
Evaporation is directly proportional to temperature, means hot food evaporates easily.
Diffusion of hot food vapors with air becomes very fast and can reach to a distant place within a very short time.