Acoustic impedance indicates how much sound pressure is generated by the vibration of molecules of a particular acoustic medium at a given frequency. The acoustic impedance Z (or sound impedance) is frequency (f) dependent and is very useful, for example, for describing the behaviour of musical wind instruments. Mathematically, it is the sound pressure p divided by the particle velocity v and the surface area S, through which an acoustic wave of frequency f propagates. If the impedance is calculated for a range of excitation frequencies the result is an impedance curve. Planar, single-frequency traveling waves have acoustic impedances equal to the characteristic impedance divided by the surface area, where the characteristic impedance is the product of longitudinal wave velocity and density of the medium. Acoustic impedance can be expressed in either its constituent units (pressure per velocity per area) or in rayls per square meter. Wikipedia, Acoustic Impedance
See Also
8.25 - Triune Acoustic Forces
15.12 - Dissociating Water with Acoustic Cavitation
15.13 - Dissociating Water Acoustically - Liberation of Quantum Constituents
Acoustic
Impedance
Principles of Acoustics
Sound Measurements