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A Level Physics Tutor

Kinetic Theory

Introduction
 

The kinetic theory of gases explains the behaviour of gases by considering the motion of their molecules. Gas pressure, temperature and internal energy can all be understood by studying the movement and collisions of particles. This model provides the foundation for the ideal gas equation and many of the thermal physics topics studied in AQA A Level Physics.
 

AQA A Level Physics Specification: 3.9.1 Kinetic Theory
 

What You Need to Know
 

  • Describe the assumptions made in the kinetic theory model of an ideal gas.

  • Explain that gas molecules move in constant random motion.

  • State that gas molecules undergo perfectly elastic collisions with each other and the walls of the container.

  • Explain how gas pressure arises from collisions between molecules and the container walls.

  • Describe the relationship between the average kinetic energy of molecules and the absolute temperature of the gas.

  • Understand the meaning of internal energy for an ideal gas.

  • Explain the limitations of the ideal gas model.

  • Apply the kinetic theory model to explain the behaviour of gases under different conditions.
     

Downloadable Topic Pack
 

Kinetic Theory Topic Pack Exam Questions and Answers
 

This downloadable resource contains carefully selected AQA A Level Physics exam questions covering the kinetic theory of gases, molecular motion, gas pressure, temperature and the assumptions of the ideal gas model, together with fully worked solutions designed to strengthen understanding and improve exam performance.
 

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