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===About Mediums===
: The [[air]] is a '''medium''' that [[sound]] can travel through. If there were no [[air]], [[sound]] could not travel from one place to another and we would not hear anything.
{| class="wikitable"
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|[[File:VibrateSound1.gif|center|200px]]
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| style="height:20px; width:200px; text-align:center;" |A [[vibration]] causing [[sound]] to travel through the air.
|}