rayln.
/reɪl/, U.S. /reɪl/ Acoustics.
A unit of specific acoustic impedance equal to one dyne-second/cm3 (in the cgs system) or one newton-second/m3 (in the SI).
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rayl1954
1954 L. L. Beranek Acoustics i. 11 The specific acoustic impedance is the complex ratio of the effective sound pressure at a point of an acoustic medium or mechanical device to the effective particle velocity at that point. The unit is newton-sec/m3, or the mks rayl. (In the cgs system the unit is dyne-sec/cm3, or the rayl.)
1983 Rev. Sci. Instruments 54 597 A prototype instrument can measure airflow resistivities in the range 10–5000 cgs rayl/cm.
1996 A. Mornington-West in J. Borwick Sound Recording Pract. (ed. 4) ii. 31 If we consider SPL [= sound pressure level] to be analogous to voltage and the resultant particle velocity analogous to current, then it is understandable that there will also be acoustic impedance (the impedance of air is around 415 rayls).
This entry has been updated (OED Third Edition, December 2008; most recently modified version published online March 2022).
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