Q3)a)A gas fill completely the vessel in which it is kept.b)Agas exerts pressure on the walls of the container.c)A wooden table should be called a solid.d)we can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.
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Answer:
A gas completely fills the vessel in which it is kept because there is negligible force of attraction between the particles of gas. Thus, the gas particles move freely in all directions.
b. A gas exerts pressure on the walls of the container because the particles of gas move randomly in all directions at high speed. As a result, the particles hit each other and also hit the walls of the container with a force. These collisions of the gas particles with the walls of the container exert pressure on the walls of the container.
c. A wooden table should be called a solid because it has a definite shape and volume. It is very rigid and cannot be compressed i.e., it has the characteristics of a solid. There is a strong force of attraction between molecules of wood and inter molecular space is the least. So, wooden table has a definite shape and volume.
d. We can easily move our hand in air, but to do the same through a solid block of wood, we need a karate expert because the particles of air have large inter molecular spaces and least force of attraction between them. Thus, one can easily move the hand in air and push the particles of air apart. However, the particles of solid have minimum amount of inter molecular space and maximum force of attraction between them. Thus, a greater amount of force is required to move the particles of solid apart. Thus, a much greater force is required to move hand through a solid block of wood.