A Rayl, rayl or Rayleigh is one of two units of specific acoustic impedance or, equivalently, characteristic acoustic impedance; one an MKS unit, and the other a CGS unit.
A Rayl, rayl, or Rayleigh is one of two units that measure specific acoustic impedance or, equivalently, characteristic acoustic impedance. One is based on the MKS system, while the other is based on the CGS system.