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Changes
→Key Stage 3
: [[Sound]] travels fastest through a [[solid]] because the [[particle]]s are already touching so they have little distance to travel to pass on the [[vibration]].
: [[Sound]] travels the slowest through a [[gas]] because the [[particle]]s in a [[gas]] are spread far apart so they take some time before they [[collide]] with the next [[particle]] to pass on the [[vibration]].
{| class="wikitable"
|-
|[[File:LongitudinalWave.gif|center]]
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| style="height:20px; width:200px; text-align:center;" |This is animation shows how [[sound]] travels along a material by [[particle]]s colliding with one another.
|}
{| class="wikitable"
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| style="height:20px; width:200px; text-align:center;" |'''Sound Waves'''
|-
|[[File:VibrateSound1.gif|center]]
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| style="height:20px; width:200px; text-align:center;" |This animation shows a [[speaker]] creating a sound by making a [[wave]] of compression (dark grey) that passes through the [[air]].
|}