sound energy density

2.67  sound energy density. Sound energy contained in an infinitesimal part of a medium at a point in a sound field divided by a representative volume at that part of the medium. Unit, joule per cubic meter (J/m³).

Annotation 1          The terms “instantaneous energy density,” “maximum energy density,” and “peak energy density” have meanings analogous to the related terms used for sound pressure.

Annotation 2          When speaking of average energy density in general, it is necessary to distinguish between the space average (at a given instant) and the time average (at a given point).