Characteristic impedance of the medium

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[ML-2T-1]; mks rayl *(Pa•s/m) - the specific normal acoustic impedance at a point in a plane wave in a free field. It is a pure specific resistance since the sound pressure and the particle velocity are in phase and it is equal in magnitude to the product of the density of the medium, p, and the speed of sound in the medium, c. Its value when the medium is air at 20 degrees Celsius and 101.25 kPa is 413 mks rayl (Pa-s/m),

Source: http://www.owenscorning.com/around/sound/glossary.asp

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