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.

Although the three states of matter are solid, liquid, and gas, not all substances seem to fit perfectly into one of these groups. Take a look at the substance below and see if you can decide whether ...

The arrangement, movement and spacing of particles are different in solids, liquids and gases. Find out more with BBC Bitesize. For students between the ages of 11 and 14. Changes of state To ...