KS3 Science: Particle Model - 5 Lessons + Free Roadmap

Why can solid rice pour, a tiny speck jiggle and trapped air push back? Explore everyday puzzles with five complete KS3 particle-model lessons.

Lessons included:

1. Solids, liquids and gases
2. Using particle theory
3. Brownian motion
4. Diffusion in liquids and gases
5. Air pressure and particle collisions

Each lesson includes four separate files: an editable PowerPoint, editable Word lesson plan with suggested practical and practical sheet, three original pupil activity pages, and separate checked teacher answers with slide guidance. The five lessons contain 20 files. The free two-page topic roadmap adds editable Word and print-ready PDF versions.

Compare rice with water, model changes of state, follow a collision track with dice, interpret dye-front data and investigate trapped air in a needle-free syringe. Thematic opening slides introduce the puzzles while the detailed tasks and answers stay in the lesson downloads.

This native TES bundle links the individual lessons and their separate files. The roadmap is also available free on its own. The price is £3: half the combined £5 lesson price, rounded up to the nearest pound.

For KS3 science, ages 11–14. A five-lesson introduction to the particle model and gas pressure; see the individual listings for equipment and practical details.