Behaviour of matterPrint
Substances expand or get bigger when they are heated up. They contract or get smaller when they are cooled down. This property can be useful.
Materials expanding and contracting can also cause problems. For example, bridges expand in the summer heat and need special joints to stop them bending out of shape.
When substances expand or contract, their particles stay the same size. It is the space between the particles that changes:
The particles in a solid vibrate more when it is heated, and take up more room.
The particles in a liquid move around each other more when it is heated, and take up more room.
The particles in a gas move more quickly in all directions when it is heated, and take up more room.
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