Materials and change


In first and second classes pupils will develop an awareness of the changes that may occur to solids and liquids through heating and cooling. They will observe through their investigations that some materials change from a solid into a liquid (melting), while cooling can change a liquid to a solid (solidification). In the middle classes pupils may also conclude that some materials can be changed permanently by heating but in other materials the changes can be reversed by cooling.

Children in the middle and senior classes will categorise materials according to the state in which they normally exist, that is, solid, liquid, or gas. They will appreciate that solids have definite shapes and may come in different forms. In the senior classes children should investigate water as a material in its different states. They should also appreciate that air is composed of different gases and should become aware of some of the practical applications of different gases in everyday use. The investigation of water and air as materials should link with and support the work outlined in the geography curriculum in the strand Natural environments.