Sound energy density


Sound energy density or sound density is the sound energy per unit volume. The SI unit of sound energy density is the pascal, that is the joule per cubic metre in SI based units.

Mathematical definition

Sound energy density, denoted w, is defined by
where
The terms instantaneous energy density, maximum energy density, and peak energy density have meanings analogous to the related terms used for sound pressure. In speaking of average energy density, it is necessary to distinguish between the space average and the time average.

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. It is a logarithmic measure of the ratio of two sound energy densities.
The energy produced by vibrations is known as sound
where E1 and E0 are the energy densities. The unit of the sound energy density level is the decibel.
If E0 is the standard reference sound energy density of