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Sound is created by vibrations such as in a guitar string, vocal chord or speaker cone. These vibrations disturb the air molecules near them, forcing molecules together and raising the air pressure slightly. The air molecules that are under pressure then push on the air molecules surrounding them, which push on the next set of air molecules, and so on, causing an area of high pressure to move though the air. When these pressure waves reach us, they vibrate the receptors in our ears, and we hear the vibrations as sound. …
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