sound pressure

noun Physics.

Also called excess sound pressure, instantaneous sound pressure. the difference between the pressure at a point in a medium through which a sound wave is passing and the static pressure of the medium at that point.

effective sound pressure.

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Origin:
1890–95

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Sound pressure is always a great word to know.

So is wavelength. Does it mean:

the analogous motion of the particles of a mass of air or the like, whose state of equilibrium has been disturbed, as in transmitting sound

the distance measured by the propagation of a wave between two successive points in the wave that are characterized by the same phase of oscillation

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WordNet

sound pressure
noun
the difference between the instantaneous pressure at a point in a sound field and the average pressure at that point

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"You can't, in sound morals, condemn a man for taking care of his own integrity. It is his clear duty. And least of all can you condemn an artist pursuing, however humbly and imperfectly, a creative aim. In that interior world where his thought and his emotions go seeking for the experience of imagined adventures, there are no policemen, no law, no pressure of circumstance or dread of opinion to keep him within bounds. Who then is going to say Nay to his temptations if not his conscience?"

-Joseph Conrad