The instantaneous sound pressure is the deviation from the local ambient pressure caused by a sound wave at a given location and given instant in time.
The effective sound pressure is the root mean square of the instantaneous sound pressure over a given interval of time (or space).
Total pressure is given by:
where:
- = local ambient atmospheric (air) pressure,
- = sound pressure deviation.
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Famous quotes containing the words sound and/or pressure:
“Only the sound remains,
the distant thump of the good elephants,
the voice of the ancient lions
and how the bells
trembled for the flying man.”
—Anne Sexton (1928–1974)
“He who is of a calm and happy nature will hardly feel the pressure of age, but to him who is of an opposite disposition youth and age are equally a burden.”
—Plato (c. 427–347 B.C.)