Particle Model Overview

This lesson provides a comprehensive overview of the entire Particle Model of Matter topic as required by the AQA GCSE Physics specification (4.3). It brings together all the key concepts from the previous lessons — density, changes of state, internal energy, specific latent heat, and gas pressure — into a single revision resource. Use this lesson to consolidate your understanding and identify any gaps in your knowledge before the exam.

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The Particle Model: Key Principles

The particle model (also called the kinetic model) describes all matter as being made up of tiny particles (atoms or molecules) that are in constant motion. The behaviour of these particles explains the properties of solids, liquids, and gases.