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States of Matter

Everything in the world exists in one of the three states of matter. Use this page to explore and develop you understanding about the states of matter.

Check out the following website for a fantastic explanation of the States of Matter

Go through the revision pages before completing the activity and tests. 

BBC Science
States of matter
Solids, liquids and gases 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.

  • 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

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 calledfreezing. Water freezes at 0°C


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