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==Key Stage 4==
===Meaning===
A '''state change''' is a [[Physical Change|physical change]] in which a [[substance]] turns from one [[State of Matter|state of matter]] into to another.
===About State Changes===
: '''State changes''' happens 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.