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- At a point in a sound field, the sound energy contained in a given
infinitesimal part of the medium divided by the volume of that part of
the medium.
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 in
general, it is necessary to distinguish between the space average (at a
given instant) and the time average (at a given point).
-
D:
[ML-1T-2]; J/m---the quotient obtained when the sound energy in a region is
divided by the volume of the region. The sound energy density at a point is the
limit of that quotient as the volume that contains the point approaches zero.
Source:
http://www.owenscorning.com/around/sound/glossary.asp
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