Acoustic admittance is the measure of the flow of acoustic energy. It is measured in cubic meters per second (), per pascal (). By nature,

acoustic impedance Acoustic impedance and specific acoustic impedance are measures of the opposition that a system presents to the acoustic flow resulting from an acoustic pressure applied to the system. The International System of Units, SI unit of acoustic impeda ...

is the reciprocal of acoustic admittance.

Immittance Immittance is a term used within electrical engineering and acoustics, specifically bioacoustics and the inner ear, to describe the combined measure of electrical or acoustic admittance and electrical or acoustic impedance. Immittance was init ...

is a concept which combines both acoustic admittance and acoustic impedance. Acoustic admittance is widely used in

bioacoustics Bioacoustics is a cross-disciplinary science that combines biology and acoustics. Usually it refers to the investigation of sound production, dispersion and reception in animals (including humans). This involves neurophysiology, neurophysiological ...

where immittance is indispensable for its ability to assist with differential diagnosis of

middle ear The middle ear is the portion of the ear medial to the eardrum, and distal to the oval window of the cochlea (of the inner ear). The mammalian middle ear contains three ossicles (malleus, incus, and stapes), which transfer the vibrations ...

disease using

tympanometry Tympanometry is an acoustic evaluation of the condition of the middle ear eardrum (tympanic membrane) and the conduction bones by creating variations of air pressure in the ear canal. Tympanometry is an objective test of middle-ear function. It ...

. Acoustic admittance also has applications in construction and engineering, and has been utilized to research and develop an open-cell polyurethane foam that had mean pore sizes of 0.01 - 0.08 cm and a fibrous structure.

References

{{Wiktionary, acoustic admittance Sound Hearing Waves Acoustics