CHANGES OF STATE

Matter can change from one state to another.

This change of state sometimes occurs when the temperature changes.

- MELTING: A solid changes into a liquid. For example, snow melts when it is warm.

- SOLIDIFICATION: A liquid changes into a solid. For example, water changes into ice when it is very cold.

- BOILING: A liquid changes into a gas. For example, water boils when it is very hot: one hundred degrees centigrade ( 100º C).

- EVAPORATION: A liquid changes into a gas. For example, water in a pond evaporates.

- CONDENSATION: A gas changes into a liquid. For example, water vapour in the air forms condensation on car windows when it is very cold.

- SUBLIMATION: A solid changes into a gas. For example, solid air fresheners change into a gas when they mix with air.