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sound intensity
Sound intensity also known as acoustic intensity is defined as the sound power per unit area. The SI unit of sound intensity is the watt per square metre (W/m2). The usual context is the noise measurement of sound intensity in the air at a listener's location as a sound energy quantity.[(【引用サイトリンク】url=http://hyperphysics.phy-astr.gsu.edu/hbase/sound/intens.html )〕]
Sound intensity is not the same physical quantity as sound pressure. Hearing is directly sensitive to sound pressure which is related to sound intensity. In consumer audio electronics, the level differences are called "intensity" differences, but sound intensity is a specifically defined quantity and cannot be sensed by a simple microphone.
Sound energy passing per second through a unit area held perpendicular to the direction of propagation of sound waves is called intensity of sound.
==Mathematical definition==
Sound intensity, denoted I, is defined by
:
where
*''p'' is the sound pressure;
*v is the particle velocity.
Both I and v are vectors, which means that both have a ''direction'' as well as a magnitude. The direction of sound intensity is the average direction in which energy is flowing.
The average sound intensity during time ''T'' is given by
:
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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