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| style="height:20px; width:200px; text-align:center;" |Inside the balloon is a [[gas]] called [[helium]].
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==Key Stage 3==
===Meaning===
'''State of matter''' means whether a [[material]] is [[solid]], [[liquid]] or [[gas]].
===About States of Matter===
: [[Material|Materials]] can be [[solid]], [[liquid]] or [[gas]].
: The '''state of matter''' can be changed by heating or cooling the material.
: Heating can turn a [[solid]] into a [[liquid]] by [[melting]] or it can turn a [[solid]] straight into a [[gas]] by [[subliming]].
: Heating can turn a [[liquid]] to a [[gas]]. This is called [[evaporating]].
: Cooling can turn a [[gas]] into a [[liquid]] by [[condensing]] or it can turn a [[gas]] into a [[solid]] by [[depositing]].
: Cooling can turn a [[liquid]] into [[solid]]. This is called [[freezing]].