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acoustic power (Pa)

Sound power (Pa) is the power that a sound source emits per unit of time in all directions. It is specified in watts and refers to the power with which a unit area is flowed through. It is calculated from the product of the sound intensity

(W/sqm) and the sounded area (sqm). The sound power of the sound source can be determined from the area-related sound power, the sound intensity, by integrating all areas that are located at a certain distance from the sound source. Depending on the sound source, the sound power can range from a few microwatts to several thousand watts.

Sound power from different sound sources

Sound power from different sound sources

Rocket engines are used for extremely high sound power of 1 MW and above. This power is 180 dB at a distance of 50 m and thus far above the human pain threshold. Jet engines reach sound power levels of about 10 kW and are also above the pain threshold at 160 dB. Only the interference of excavators and power saws or the music of pianos and trumpets have about the same sound power, which is less than 1 W and about 110 dB, but is psychoacoustically evaluated completely differently.

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Englisch: acoustic power - Pa
Updated at: 16.10.2019
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