Give reasons:

(a) A gas fills completely the vessel in which it is kept.

The force of attraction between gas particles is quite weak.

The particles in the filled vessel are free to move about.

(b) A gas exerts pressure on the walls of the container.

The attraction between gas particles is the weakest.

They move at random all the time.

When a gas particle collides with the container's walls, force and pressure are applied to the wall.

(c) A wooden table should be called a solid.

The wooden table is defined by its shape and volume.

The wood particles are tightly packed.

They do not conform to the container's shape.

As a result, the solid features of a hardwood table are satisfied.

(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.

The boundaries between air particles are exceedingly loose.

They are separated from one another by a large amount of space.

As a result, we may move our hands freely in the air.

A strong force of attraction holds the particles together in a solid block.

So, there is either some or no gap between them.

As a result, we require a karate specialist.

Hence, the reasons of the statements are given below.

(a) A gas fills completely the vessel in which it is kept because the force of attraction between gas particles is quite weak.

(b) A gas exerts pressure on the walls of the container because the attraction between gas particles is the weakest and they move at random all the time, so force and pressure are applied to the wall.

(c) A wooden table should be called a solid because it is defined by its shape and volume, its particles are tightly packed, and they do not conform to the container's shape.

(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 boundaries between air particles are exceedingly loose, while a strong force of attraction holds the particles together in a solid block.