GCSE Physics (AQA)

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Kinetic Theory of a Gas

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Particle model of matter Particle model and pressure

Kinetic Theory of a Gas

1:44 Gas Pressure and Kinetic Theory
Spec 4.3.3.1
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  • The kinetic theory of gas models the behavior of gas particles.
  • It is a theoretical model since direct observation of gas particles is not possible.
  • The theory explains most known observations of gases effectively.
  • Gas particles are in constant random motion.
  • Particles move in random directions and speeds, and they spread out.
  • Gas particles change direction due to collisions with container walls and other particles.
  • Collisions with walls are more frequent than collisions between particles due to the small size and spread-out nature of the particles.
  • Particles do not lose speed during collisions because no kinetic energy is transferred, maintaining the total kinetic energy of the system.
  • A change in the total kinetic energy of the system can be caused by a change in temperature.
  • Increasing the temperature raises the average kinetic energy and therefore the average speed of the particles.
  • For exams, students should understand the kinetic theory of gas and how temperature changes affect the kinetic energy of particles.
  • Temperature is described as a measure of the kinetic energy in the system.

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