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Solid, liquid and gas are called the three states of matter.

Materials can be changed from one state to another by heating or cooling.
Heating

* If ice (solid) is heated, it changes to water (liquid). This change is called melting.
* If water (liquid) is heated, it changes to water vapour (gas). This change is called evaporation.

Cooling

* If water vapour (gas) is cooled, it changes to water (liquid). This change is called condensing.
* If water (liquid) is cooled, it changes to ice (solid). This change is called freezing.
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