Acoustic approximation

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A fundamental principle in the field of acoustics, the acoustic approximation states that an acoustic wave is created by a small pressure ripple riding on a comparatively large equilibrium (bias) pressure. Typically, the acoustic pressure is on the order of a few ppm of the equilibrium pressure.

By extension, the acoustic approximation also guarantees that an acoustic wave travels at a speed much less than the speed of sound, such that:

Ma < < 1

[edit] See also

• Sound

[edit] References

[edit] External links