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==Key Stage 2==
===Meaning===
'''Sound''' is a [[Vibrate|vibration]] that passes through the [[air]] to our [[Ear|ears]].
===About Sound===
: '''Sounds''' are caused by materials [[Vibration|vibrating]].: '''Sound''' travels through the air because it makes the air [[Vibration|vibrate]]. If there were no sound could not travel to our ears.
: '''Sounds''' can be high or low pitched.
: '''Sounds''' can be loud or quiet.
===Volume===
{| class="wikitable"
|+ The bigger the [[vibration]], the louder the sound.
|-
|[[File:Drumkit.png|center|300px]]
|[[File:Tuba.png|center|300px]]
|-
| style="height:20px; width:300px; text-align:center;" |When you hit a drum hard, it makes a louder '''sound''' because the [[Vibrate|vibration]] is bigger.| style="height:20px; width:300px; text-align:center;" |When you pluck a guitar string harder, it makes a louder '''sound''' because the [[Vibrate|vibration]] is bigger.
| style="height:20px; width:300px; text-align:center;" |Blow harder down a tube it makes a louder '''sound''' because the [[vibration]] is bigger.
|}