Rayl
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A Rayl is a unit of acoustic impedance and has the same name when using either the CGS definition or the MKS-based definition.
When sound waves pass through any physical substance the pressure of the waves causes the particles of the substance to move. The sound impedance is the ratio between the pressure and the particle velocity it produces. The impedance is 1 rayl if unit pressure produces unit velocity.
In MKS units, this means 1 rayl equals 1 pascal-second per meter (Pa·s·m−1), or equivalently 1 newton-second per cubic meter (N·s·m−3). In SI base units, that’s kg∙s−1∙m−2.
In CGS units, 1 rayle equals 1 dyne-second per cubic centimeter (dyn·s·cm−3). The CGS rayl equals 10 MKS rayls.
The units are named for Robert John Strutt, 4th Baron Rayleigh (1875–1947).
