Particles
Everything is made of tiny particles that are always moving.
01The Particle ModelMeet the idea that all matter is made of tiny moving particles.Read lesson →02Solids, Liquids and GasesCompare how particles are arranged and move in each state.Read lesson →03Changes of StateExplain melting, boiling, condensing and freezing with particles.Read lesson →04Spreading by DiffusionSee how particles spread from crowded places to empty ones.Read lesson →