Question

Gas exerts pressure on the walls of container because the molecules:

• A. Are losing their Kinetic Energy
• B. Are getting stuck to the walls
• C. Are transferring their momentum to walls
• D. Are accelerated towards walls

Answer 1

Answer: (C)

Are transferring their momentum to walls

Pressure is force per unit area

and force is nothing but the rate of change of momentum

When the molecules collide with wall their direction get changed so their momentum get changed and this difference

in momentum after and before the collision is given to the walls so walls feel a force consequently Pressure.

Energy remains constant because collisions are supposed to be $elastic$

Option C is correct.