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.
Read more about this topic: Sound Pressure
Famous quotes containing the words sound and/or pressure:
“Midnight has come and the great Christ Church bell
And many a lesser bell sound through the room;
And it is All Souls’ Night.
And two long glasses brimmed with muscatel
Bubble upon the table. A ghost may come;
For it is a ghost’s right....”
—William Butler Yeats (1865–1939)
“Destiny is an absolutely definite and inexorable ruler. Physical ability and moral determination count for nothing. It is impossible to perform the simplest act when the gods say “no.” I have no idea how they bring pressure to bear on such occasions; I only know that it is irresistible.”
—Aleister Crowley (1875–1947)