The acoustic impedance Z in Pa·s/m (or, in the equivalent units common before the pascal was added to SI, N·s/m3) is:
The acoustic impedance (characteristic impedance) of air is Z = 410 Pa·s/m at the temperature 25 °C (77 °F) or 413 Pa·s/m at 20 °C (68 °F). °C = degree Celsius and °F = degree Fahrenheit.
Ohm's law of the acoustics - calculation of acoustic impedance Z sound pressure p particle velocity v sound intensity J (http://www.sengpielaudio.com/calculator-ak-ohm.htm)
The acoustic impedance Z (or soundimpedance) is the ratio of sound pressure p to particle velocity v in a medium or acoustic component.
The characteristic impedance of a medium (usually air, but also for instance exhaust gases in a muffler) is the ratio of sound pressure p to particle velocity v in open field (i.e.
The acoustic impedance Z of an acoustic component (in Pa·s/m) is the ratio of sound pressure p to particle velocity v at a transition with a previous component:
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