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Solids, liquids and gasses have physical properties. The way they behave is
affected by heating and cooling. We will also look at pressure and diffusion in
gases.

Substances expand or get bigger when they are heated up. They contract or get
smaller when they are cooled down. This property can…

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Heating increases pressure

If a gas is heated up, its particles move around more quickly. They hit the walls of
their container harder and more often. This increases the pressure. Sometimes
the pressure gets so great that the container bursts.
This is why balloons and tyres burst if you blow…

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Diffusion does not happen at all in solids because the particles in a solid can only
vibrate on the spot, rather than being able to move from place to place.

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