Helivõimsus on määratletud kui „helirõhu ja osakeste kiiruse komponendi korrutis pinna punktis normaali suunas läbi pinna integreerituna üle selle pinna“.
Sound power is defined as "through a surface, the product of the sound pressure, and the component of the particle velocity, at a point on the surface in the direction normal to the surface, integrated over that surface."
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