The pressure exerted by a gas is a result of

The pressure exerted by a gas is a result of 

A. bombardment of the walls of the container by its molecules

B. the collision between the gas molecules

C. the continuous random motion of it's particles

D. the elastic nature of the gas molecules

E. the expansion of the gas molecules

The correct answer is A. bombardment of the walls of the container by its molecule

Explanation:

Gas molecules are in constant random motion. When they collide with the walls of the container, they exert a force on the walls. The total force per unit area of these collisions is what we call gas pressure.

Why the others are not correct:

B. collision between gas molecules → This happens, but it does not directly cause pressure on the container walls.

C. continuous random motion → This explains why collisions happen, but pressure itself comes from wall collisions.

D. elastic nature of gas molecules → Elastic collisions help conserve energy, but they are not the direct cause of pressure.

E. expansion of gas molecules → Expansion is an effect, not the cause of pressure.

QUESTION NUMBER ONE