| Themes > Science > Physics > Acoustics > Theory and History of Sound > What is sound ? > What is sound ? |
Sound is the quickly varying pressure wave within a medium.We usually mean audible sound, which is the sensation (as detected by the ear) of very small rapid changes in the air pressure above and below a static value. This “static” value is atmospheric pressure (about 100,000 Pascals) which does nevertheless vary slowly, as shown on a barometer. Associated with the sound pressure wave is a flow of energy. |
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