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→Key Stage 4
===About State Changes===
: '''State changes''' happen when a [[substance]] gains enough [[energy]] to break the [[bond]]s holding [[particle]]s together or loses enough [[energy]] for [[bond]]s to form between [[particle]]s.
: When the [[particle]]s in a [[solid]] gain enough [[Potential Energy|potential energy]] to break the [[bond]]s holding them in fixed positions the [[substance]] becomes a [[liquid]].
When a [[substance]] changes from [[solid]] to [[liquid]] and [[liquid]] to [[gas]] the [[particle]]s need to gain [[Potential Energy|potential energy]].