Solids, liquids and gases are called the three states of matter.
Materials can be changed from one state to another by heating or cooling.
If ice (solid) is heated, it changes to water (liquid). This change is called melting.
Water (liquid) can change to water vapour (gas). This is called evaporation.
If water (liquid) is heated until it boils, it changes to water vapour (gas) very quickly. Water boils at 100°C
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. Water freezes at 0°C
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