EntityQ1140289· pop 42· linked from 98 articles

sound intensity

instantaneous product of sound pressure and particle velocity

Key facts

Characteristic: Symbols
Sound pressure: p , SPL, L PA
Particle velocity: v , SVL
Particle displacement: δ
Sound intensity: I , SIL
Sound power: P , SWL, L WA
Sound energy: W
Sound energy density: w
Sound exposure: E , SEL
Acoustic impedance: Z
Audio frequency: AF
Transmission loss: TL

via Wikipedia infobox

Article

Sound intensity, also known as acoustic intensity, is defined as the power carried by sound waves per unit area in a direction perpendicular to that area, also called the sound power density and the sound energy flux density. The SI unit of intensity, which includes sound intensity, is the watt per square meter (W/m). One application is the noise measurement of sound intensity in the air at a listener's location as a sound energy quantity.

Sound intensity is not the same physical quantity as sound pressure. Human hearing is 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.