Rayl
Encyclopedia
A rayl is one of two units of specific acoustic impedance.
When sound waves pass through any physical substance the pressure of the waves causes the particles of the substance to move.
The sound specific impedance is the ratio between the sound pressure
and the particle velocity
it produces.
The specific impedance is one rayl if unit pressure produces unit velocity.
The units are named after John William Strutt, 3rd Baron Rayleigh (12 November 1842 – 30 June 1919).
They have the same name when using either the CGS definition or the MKS
-based definition, but not the same value:
1 CGS rayl = 10 MKS rayls.
When sound waves pass through any physical substance the pressure of the waves causes the particles of the substance to move.
The sound specific impedance is the ratio between the sound pressure
Sound pressure
Sound pressure or acoustic pressure is the local pressure deviation from the ambient atmospheric pressure caused by a sound wave. Sound pressure can be measured using a microphone in air and a hydrophone in water...
and the particle velocity
Particle velocity
Particle velocity is the velocity v of a particle in a medium as it transmits a wave. In many cases this is a longitudinal wave of pressure as with sound, but it can also be a transverse wave as with the vibration of a taut string....
it produces.
The specific impedance is one rayl if unit pressure produces unit velocity.
The units are named after John William Strutt, 3rd Baron Rayleigh (12 November 1842 – 30 June 1919).
They have the same name when using either the CGS definition or the MKS
Si
Si, si, or SI may refer to :- Measurement, mathematics and science :* International System of Units , the modern international standard version of the metric system...
-based definition, but not the same value:
- In MKS units, 1 rayl equals 1 pascalPascal (unit)The pascal is the SI derived unit of pressure, internal pressure, stress, Young's modulus and tensile strength, named after the French mathematician, physicist, inventor, writer, and philosopher Blaise Pascal. It is a measure of force per unit area, defined as one newton per square metre...
-secondSecondThe second is a unit of measurement of time, and is the International System of Units base unit of time. It may be measured using a clock....
per meter (Pa·s·m−1), or equivalently 1 newton-second per cubic meter (N·s·m−3). In SI base unitSI base unitThe International System of Units defines seven units of measure as a basic set from which all other SI units are derived. These SI base units and their physical quantities are:* metre for length...
s, that’s kg∙s−1∙m−2. - In CGS units, 1 rayl equals 1 dyneDyneIn physics, the dyne is a unit of force specified in the centimetre-gram-second system of units, a predecessor of the modern SI. One dyne is equal to exactly 10 µN...
-second per cubic centimeter (dyn·s·cm−3).
1 CGS rayl = 10 MKS rayls.