(at a surface)
The complex quotient of the sound pressure and the volume velocity through the surface.
Note: This definition is valid only for sinusoidal vibrations in the steady state.
Reference: Icharge currentIntensity.EIlluminanceEnergy.CContrastCelsius (previously Centigrade)Capacitance. (modified)
Please note that this is the term as it stands in the original IALAInternational Association of Marine Aids to Navigation and Lighthouse Authorities - AISM Dictionary edition (1970-1989)