# Sound intensity level

Sound intensity level

Sound intensity level or acoustic intensity level is a logarithmic measure of the sound intensity in comparison to the reference level of 0 dB (decibels).

The measure of a ratio of two sound intensities is:$L_mathrm\left\{J\right\}=10, log_\left\{10\right\}left\left(frac\left\{J_1\right\}\left\{J_0\right\} ight\right) mathrm\left\{dB\right\} ,$

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:$J_0 = 10^\left\{-12\right\} , frac\left\{mathrm\left\{W\left\{mathrm\left\{m\right\}^2\right\} ,$

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

* [http://www.sengpielaudio.com/calculator-soundlevel.htm Conversion: Sound intensity level to sound intensity and vice versa]
* [http://www.sengpielaudio.com/calculator-ak-ohm.htm Ohm's law as acoustic equivalent - calculations]
* [http://www.sengpielaudio.com/RelationshipsOfAcousticQuantities.pdf Relationships of acoustic quantities associated with a plane progressive acoustic sound wave - pdf]
* [http://www.sengpielaudio.com/TableOfSoundPressureLevels.htm Table of Sound Levels - Corresponding Sound Intensity and Sound Pressure]

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