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|+ Making shapes with playdough is a reversible process.
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|[[File:Playdough.png|center|200px400px]]
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| style="height:20px; width:200px400px; text-align:center;" |Once you squash playdough into a new shape you can squeeze it back into the original shape.|} {| class="wikitable"|+ Melting and Freezing are reversible.|-|[[File:Melting.png|center|600px]]|-| style="height:20px; width:600px; text-align:left;" | A [[solid]] will [[Melting|melt]] and become a [[liquid]]. You can then [[Freezing|freeze]] it to become a [[solid]] again.|-|[[File:Freezing.png|center|600px]]|} {| class="wikitable"|+ Condensing and Evaporating are reversible.|-|[[File:Condensing.png|center|600px]]|-| style="height:20px; width:600px; text-align:left;" | When a [[gas]] is [[Condensing|condensed]] into a [[liquid]] you can always [[Evaporating|evaporate]] it back into a [[gas]].|-|[[File:Evaporating.png|center|600px]]
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