Question

Give reasons
lat A gas fills completely the
vessel in which it is kept.
(b) A gas 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.​

Answer 1

Answer:

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Answer 2

HI HOPE THIS HELPS

Solution:

a)

Gas fills completely The vessel in which it is kept because the due to high kinetic energy and negligible forces of attraction the particles of a gas are moving with a speed in all directions and the gas completely filled The vessel in which it is kept..

b)

A gas exerts pressure on the walls of the container because of High kinetic energy & negligible forces of attraction the particles of a gas move with high speed in all direction when the fast moving gas particles hit the walls of the container from inside they exert a gas pressure.

Hence, the pressure exerted by gas is due to the constant collisions of the fast moving gas particles against that inner walls of the container.

c)

A wooden table should be called a solid because a wooden table is a rigid object having a definite shape and definite volume.

Since a wooden table has rigidity, definite shape & definite volume it should be called a solid.

d)

Because it is a gas and the particles of gas are very far apart and they have a very weak forces of attraction between them . The extremely weak forces between the particles of air can be overcome easily due to which we can easily move our hand in air.

The particles of solid block of wood very closely packed and solid particles have a strong forces of attraction between them. So it needs are strong force to overcome the strong interparticle attraction of block of wood and break it apart by moving our hand which only a Karate expert can apply.