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Sound
A B C D E F H I M N O P R S T U W
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Sound

Sound is defined as the mechanical vibration of an elastic medium such as air (air-borne sound), liquids (liquid-borne sound) and solid bodies (solid-borne sound). Depending on the medium, the mechanical vibrations propagate by longitudinal waves (in the direction of propagation) or transversal waves (perpendicular to the direction of propagation). The sound’s intensity diminishes with growing distance from the sound source.