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

Sound energy is a form of energy associated with the vibration. of matter. The SI unit of sound energy is the joule (J). Sound is a mechanical wave and as such consists physically in oscillatory elastic compression and in oscillatory displacement of a fluid. Therefore, the medium acts as storage for both potential and kinetic energy as well.〔

Consequently, the sound energy in a volume of interest is defined as the sum of the potential and kinetic energy densities integrated over that volume:
:W = W_\mathrm + W_\mathrm = \int_V \frac\, \mathrmV + \int_V \frac\, \mathrmV,
where
*''V'' is the volume of interest;
*''p'' is the sound pressure;
*''v'' is the particle velocity;
*''ρ''0 is the density of the medium without sound present;
*''ρ'' is the local density of the medium;
*''c'' is the speed of sound.
==See also==

*Sound energy density level

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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