How does sound travel?

Q6. How does sound travel?
Ans. Every sound is created by vibration, be it an elastic band twanging or a loud speaker cone shaking to and fro. But you can’t hear any sounds in a vacuum. This is because the sound reaches your ears as a vibration- and there must be something to vibrate. Normally, this is the air. When a sound source vibrates to and fro, it pushes the air around it to and fro. 

The sound Travels through the air as it is pushed to and fro in a knock-on effect- that is by being alternatively stretched and squeezed. This moving stretch and squeeze of air is called a sound wave.

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