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==Key Stage 4==
===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]] or increasing or decreasing the [[pressure]] on the [[material]].
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