Parameterizing frictional energy losses in pressure waves

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Nabeshin
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For a sound wave in a given medium, there will inevitably be frictional energy losses that will damp the amplitude of oscillation. Furthermore, assuming the wave spreads out in all three dimensions, intensity of the wave will drop like 1/r2 just because of the increasing area. The question is then: How can one incorporate the frictional losses in the intensity dropoff calculation?

Naturally, this will depend on some viscous properties of the medium, so if anyone knows of any tables with various values (I'm specifically concerned with normal air, but other fluids would be great too), I'm sure these would prove necessary.
 

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