Sound Power Level

Of airborne sound, ten times the common logarithm of the ratio of the sound power under consideration of the standard reference power of 1 pW. The quantity so obtained is expressed in decibels.

For a simple monopole in free space the sound power is expressed as:
where
Π = sound power [W]
ρ0 = density of air [kg m-3]
c = speed of sound [ms-1]
Q = volume velocity [m3s-1]
λ = wavelength [m]

The volume velocity of the source is the surface area of the source multiplied by the surface normal velocity.

See also: Decibel, Sound Intensity, Sound Pressure Level.

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Subjects: Noise & Vibration