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| style="height:20px; width:300px; text-align:center;" |Blow harder down a tube it makes a louder '''sound''' because the [[vibration]] is bigger.
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==Key Stage 3==
===Meaning===
[[Sound]] is a [[longitudinal]] [[wave]] of compression that can pass through a [[material]].
===About Sound===
: [[Sound]] [[wave]]s can pass through [[solid]]s, [[liquid]]s and [[gas]]es but [[sound]] cannot pass through a [[vacuum]].
: [[Sound]] is transmitted by [[particle]]s colliding with one another.
: [[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]].