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| style="height:20px; width:600px; text-align:left;" |The [[particle]]s in the [[liquid]] slow down until they are slow enough that [[force]]s between the [[particle]]s start to hold them in fixed positions. The [[particle]]s become stuck in fixed positions which makes the [[State of Matter|state]] a [[solid]].
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==Key Stage 4==
===Meaning===
[[Freezing]] is an [[exothermic]] [[Physical Change|physical change]] in which a [[liquid]] turns into a [[solid]].
===About Freezing===
: [[Freezing]] happens when the [[particle]]s in a [[liquid]] form [[bond]]s holding them in fixed positions as they lose [[Potential Energy|potential energy]].
: The [[temperature]] at which a [[substance]] '''freezes''' is the same as the [[temperature]] at which it [[melting|melts]] so it is the [[Melting Point|melting point]].
: [[Freezing]] is an [[exothermic]] process, which means it [[emit]]s [[energy]] when it takes place.
: [[Freezing]] is a [[Physical Change|physical change]], which means it is [[Reversible Changes|reversible]] and does not produce new [[chemical]]s.
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|[[File:FreezingGraph.png|center|500px]]
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| style="height:20px; width:500px; text-align:left;" |As a [[liquid]] is cooled the [[Internal Energy|internal energy]] decreases. As the [[liquid]] '''freezes''' the [[temperature]] of the [[substance]] stays the same.
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