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'''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 ]] and turn a [[liquid ]] to a [[gas]].: Cooling can turn a [[gas ]] into a [[liquid ]] and [[liquid ]] into [[solid]].
====Solid====