1. 
   Rayl
   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 sp...
   Found op http://en.wikipedia.org/wiki/Rayl
   
   
2. 
   Rayl
   The Rayl is the SI derived unit of specific acoustic impedance. 1 MKS Rayl = 1 Pa s/m (this unit was established in honour of Lord Rayleigh).
   Found op http://www.diracdelta.co.uk/science/source/r/a/rayl/source.html
   
   
3. 
   rayl
   Unit of acoustic impedance. 1 rayl = 1 kg × m-2 × sec-1. ... Origin: Baron Rayleigh (John W. Strutt), Eng. Physicist ... (05 Mar 2000) ...
   Found op http://www.mondofacto.com/facts/dictionary?rayl
   
   
4. 
   rayl
   (from the article `sound`) The unit of specific acoustic impedance is the pascal second per metre, often called the rayl, after Lord Rayleigh. The unit of acoustic impedance is ...
   Found op http://www.britannica.com/eb/a-z/r/16
   
   
5. 
   rayl
   Type: Term Pronunciation: rāl Definitions: 1. Unit of acoustic impedance. 1 rayl = 1 kg ׀ m−2 ׀ sec−1.
   Found op http://www.medilexicon.com/medicaldictionary.php?t=76010
   
   

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