Solids, liquids and gases. In a solid like this brick, the particles are regularly arranged touching their neighbours and move only by vibrating. This explains why solids have a fixed shape. In a ...

Matter can exist in three common states on Earth: solid, liquid and gas. This series explores how matter changes state and how we use matter in all states in our everyday lives. Excellent introductory ...

Almost everything is made of particles. Particles can be atoms, molecules or ions. Particles behave differently in solids, liquids and gases. The particle model explains the differences between solids ...