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.

He concluded that all matter was made of tiny particles called atoms. He suggested that an atom was a tiny solid ball ... to the atomic model Atoms can be broken down into smaller parts.

The size of particles found in a colloidal dispersion range between 1 and 1000 nanometres. The two components are referred to as the dispersed phase and continuous phase respectively. Either phase can ...