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

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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