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- The sound pressure is the total instantaneous
pressure at a point in space, in the presence of a sound wave, minus the
static pressure at that point.
- p:
[ML-1T-2]; Pa-a fluctuating pressure superimposed on the static pressure by the
presence of sound. In analogy with alternating voltage its magnitude can be
expressed in several ways, such as instantaneous sound pressure or peak sound
pressure, but the unqualified term means root-mean-square sound pressure. In
air, the static pressure is barometric pressure.
Source:
http://www.owenscorning.com/around/sound/glossary.asp
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