Particle Model and Pressure [H]

This lesson provides a deeper exploration of how the particle model explains gas pressure and how changes in temperature and volume affect pressure, as required by the AQA GCSE Physics specification (4.3.3). This is Higher Tier only content, labelled [H]. You need to be able to explain pressure changes in terms of the motion and collisions of gas particles, linking kinetic energy, temperature, volume, and pressure together.

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The Particle Model of a Gas

The particle model (sometimes called the kinetic theory of gases) describes gas behaviour in terms of the motion of its particles. The key assumptions are: