Give reasons :-
A gas exerts pressure on the walls of the container.

Why does a gas exert pressure on the wall of its container?What are the two factors on which this pressure depends?

Why gas molecule exerts pressure inside the container?

A manometer reads the pressure of a gas in an enclosure as shown in Fig. 10.25 (a) When a pump removes some of the gas, the manometer reads as in Fig. 10.25 (b) The liquid used in the manometers is mercury and the atmospheric pressure is 76 cm of mercury. (a) Give the absolute and gauge pressure of the gas in the enclosure for cases with mercury)

A cylinder with a movable piston contains 3 moles of hydrogen at standard temperature and pressure. The walls of the cylinder are made of a heat insulator, and the piston is insulated by having a pile of sand on it. By what factor does the pressure of the gas increase if the gas is compressed to half its original volume?

Give reasons :- A gas fills completely the vessel in which it is kept.

Pressure of gas is due to-

Give reason - Why : School bells are made of metals.

Give reasons :- A wooden table should be called a solid.