# Sound energy density level

The sound energy density level gives the ratio of a sound incidence as a sound energy value in comparison to a reference level of 0 dB (DIN 45630). It is a logarithmic measure of the ratio of two sound energy densities.

The energy produced by vibrations is known as sound

${\displaystyle L(E)=10\,\log _{10}\left({\frac {E_{1}}{E_{0}}}\right){\rm {dB}}}$

where E1 and E0 are the energy densities. The unit of the sound energy density level is the decibel (dB).

If E0 is the standard reference sound energy density of[1]

${\displaystyle E_{0}=10^{-12}\mathrm {\frac {J}{m^{3}}} }$

## References

1. ^ DIN 1320: Acoustics, Version 1997-06, Beuth publishing