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The sound energy density or sound density (symbol ''E'' or ''w'') is an adequate measure to describe the sound field at a given point as a sound energy value. The letter "lower case w" sign is easily mixed with the sign (omega), therefore we choose here the letter ''E''. In opposite to the sound intensity ''I'', which gives the sound energy per area ''A'', the sound energy density ''E'' (also: sound density) describes the time medium value of the sound energy per volume unit; it gives information obout the sound energy which is at a definded place of room. The sound energy density ''E'' (or ''w'') for an even-proceeding Sound Wave is: :, where ''I'' is the Sound Intensity in W/m2 and ''c'' is the Sound Speed in m/s. The sound energy density is given in J/m3, where the joule J = W·s = N·m. You will find also W·s/m3 or N·m/m3. The sound energy density is N/m2 = pascals, the same as the units of sound pressure. 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). More formulas for sound energy density for even proceeding sound waves: : where: For digits of the sound energy density the RMS value will be given. But you get also the Level in DB . See Sound Energy Density Level . SEE ALSO |
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