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        QUDT VOCAB Quantity Kinds  Release 2.1.25
       
 
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 quantitykind:SoundReductionIndex
    
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 http://qudt.org/vocab/quantitykind/SoundReductionIndex
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 Sound reduction index
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 http://en.wikipedia.org/wiki/Sound_reduction_index
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 \(R = 10 \log (\frac{1}{\tau}) dB\), where \(\tau\) is the transmission factor.
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 The Sound Reduction Index is used to measure the level of sound insulation provided by a structure such as a wall, window, door, or ventilator.
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 R
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 belongs to SOQ-ISO