Sound energy flux

Sound energy flux

The sound energy "q" results from the integral particle velocity "v" of the surface " A ", whereby only the portions perpendicularly to the surface acoustic velocity are important.:q = int overrightarrow{v} , overrightarrow{mathrm{d}A}

The sound energy flux marks the volume of the transmitting medium (air), which - caused by the excess sound pressure - and flows per time unit (1 s) by a surface "A".

The sound energy flux is the average rate of flow of sound energy for one period through any or spherical free wave having a velocity of propagation "v", the sound energy flux through the area "A" corresponding to an effective sound pressure "p" is

:"J = (p2A / ρ v)" cos "θ"

where "θ" = the angle between the direction of propagation of the sound and the normal to the area "A".


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