(a) What is meant by 'diffusion'? Give one example of diffusion in gases.
(b) Why do gases diffuse very fast?
(c) Name two gases of air which dissolve in water by diffusion. What is the importance of this process in nature?
(a) What is meant by 'diffusion'? Give one example of diffusion in gases.
(b) Why do gases diffuse very fast?
(c) Name two gases of air which dissolve in water by diffusion. What is the importance of this process in nature?
(a) The spreading out and mixing of a substance with another substance due to the motion of its particles is called diffusion.
For example: The smell of perfume spreads over a whole room is an example for diffusion.
(b) Gases diffuse very fast because of the large space between the particles in gases and high kinetic energy.
The particles in gases move very quickly in all directions.
(c) Carbon dioxide and oxygen are the two gases in air which dissolves in water by diffusion. This process is important as these gases are essential for the survival of aquatic plants and animals.
The aquatic plants use the dissolved carbon dioxide for preparing food by photosynthesis and aquatic animals use the dissolved oxygen in the water for breathing.
(a) The spreading out and mixing of a substance with another substance due to the motion of its particles is called diffusion.
For example: The smell of perfume spreads over a whole room is an example for diffusion.
(b) Gases diffuse very fast because of the large space between the particles in gases and high kinetic energy.
The particles in gases move very quickly in all directions.
(c) Carbon dioxide and oxygen are the two gases in air which dissolves in water by diffusion. This process is important as these gases are essential for the survival of aquatic plants and animals.
The aquatic plants use the dissolved carbon dioxide for preparing food by photosynthesis and aquatic animals use the dissolved oxygen in the water for breathing.
