The Particle Model: States of Matter, Diffusion and Density

A Key Stage 3 science course on the particle model: how particles are arranged and move in solids, liquids and gases, what happens during changes of state, how diffusion and gas pressure work, and how to calculate density – with worked examples and common misconceptions.

Tutwoo Kids is an independent learning provider. It is not affiliated with or endorsed by the Department for Education, Ofqual or any exam board. Our certificates celebrate completing a course; they are not qualifications.