States of matter
Saturday, October 2, 2010, 12:58 PM - Top Tips
States of matter
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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