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Sound intensity level or '''acoustic intensity level''' is a Logarithm ic measure of the Sound Intensity in comparison to the reference level of 0 dB ( Decibel s).

The measure of a ratio of two Sound Intensities is
:
L_\mathrm{J}=10\, \log_{10}\left( rac{J_1}{J_0} ight)\ \mathrm{dB}


where ''J''1 and ''J''0 are the intensities.

The sound intensity level is given the letter "LJ" and is measured in "dB". dB is Dimensionless .

If J0 is the standard reference sound intensity, where
:J_0 = 10^{-12} \, rac{\mathrm{W}}{\mathrm{m}^2}

(W = watt), then instead of "dB" we use "dB SIL". (SIL = sound intensity level).


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