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===About Longitudinal Waves===
: [[Sound]] [[wave]]s are [[longitudinal]] [[wave]]s.
==Key Stage 4==
===Meaning===
A [[longitudinal]] [[wave]] is a [[wave]] in which the direction of [[vibration]] is [[parallel]] to the direction of travel of the [[wave]].
{| class="wikitable"
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|[[File:LongitudinalWave.gif|center]]
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| style="height:20px; width:200px; text-align:center;" |A single [[longitudinal]] [[wave]] passing through a material.
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===About Longitudinal Waves===
There are two [[longitudinal]] [[wave]]s you should know:
*[[Sound]] - [[Wave]]s of [[Compression Wave|compression]] and [[rarefaction]] which travel through [[matter]].
*[[P-wave]]s - [[Seismic Wave]]s known as [[P-wave|primary waves]] which are [[wave]]s of [[Compression Wave|compression]] through the ground during an [[earthquake]].