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Sound is carried through the air by pressure waves. Think of the ripples in a pond caused by a thrown rock. The crests of the ripples would correspond to higher air pressure while the troughs would correspond to lower pressure. These pressure waves, moving away from the sound source at the speed of sound, are very slight but the human ear drum will flex with very small changes in pressure. This tiny flexing of the ear drum is sent to the inner ear by the bones behind the ear drum.

It is known as the longitudinal wave.This travels by compressions and rarefactions caused in air.

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15y ago

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