Home › MCQs › EEJ MAIN Physics › Question #7022
Back to Questions
EEJ MAIN Physics QUESTION #7022
Question 1
According to the kinetic theory of gases, why do gas molecules exert pressure on the walls of their container?
  • They undergo a change in momentum when hitting the walls.✔️
  • They continuously stick to the walls.
  • They lose energy until they reach the wall.
  • They are attracted by the forces of the walls.
Correct Answer Explanation
Pressure is defined as force per unit area. Force is the rate of change of momentum. When molecules collide elastically with the walls, their direction changes, resulting in a change in momentum which exerts a force on the wall.