Question

3. give reasons
(a) 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
we need a karate expert.​

Answer 1

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• a) Kinetic energy possessed by gas particles is very high which allows them to randomly move across all directions when contained, hence the particles fills the gas vessel entirely.

• b) Gas molecules possess high kinetic energy, due to which they are under constant motion inside the container in random directions which causes them to hit the walls of the container and hence create vibrations. These collisions with the walls of the container generate pressure.

• c) A wooden table should be called a solid as it possesses all the properties of a solid such as:Definite size and shape

• Intermolecular attraction between closely packed particles.It is rigid and cannot be compressed

• d) Molecules in gases are loosely packed as compared to solid molecules which are densely packed.Hence we are easily able to break the force of attraction when we move our hand through air but find it difficult to break through a solid (because of greater forces of attraction between molecules)