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Defined byquantitykind:
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quantitykind:SoundVolumeVelocity
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http://qudt.org/vocab/quantitykind/SoundVolumeVelocity

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Sound volume velocity
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Applicable units are those of quantitykind:SoundVolumeVelocity
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Sound Volume Velocity is the product of particle velocity $v$ and the surface area $S$ through which an acoustic wave of frequency $f$ propagates. Also, the surface integral of the normal component of the sound particle velocity over the cross-section (through which the sound propagates). It is used to calculate acoustic impedance.
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http://en.wikipedia.org/wiki/Acoustic_impedance
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$q= vS$, where $v$ is sound particle velocity and $S$ is the surface area through which an acoustic wave of frequence $f$ propagates.
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q
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belongs to SOQ-ISO