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Sound pressure : ウィキペディア英語版
Sound pressure

Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average, or equilibrium) atmospheric pressure, caused by a sound wave. In air, sound pressure can be measured using a microphone, and in water with a hydrophone. The SI unit of sound pressure is the pascal (Pa).(【引用サイトリンク】url=http://www.engineeringtoolbox.com/sound-pressure-d_711.html )
==Mathematical definition==

A sound wave in a transmission medium causes a deviation (sound pressure, a ''dynamic'' pressure) in the local ambient pressure, a ''static'' pressure.
Sound pressure, denoted ''p'', is defined by
:p_\mathrm = p_\mathrm + p,
where
*''p''total is the total pressure;
*''p''stat is the static pressure.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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