acoustic streaming
5.41 acoustic streaming. Name given to unidirectional flow in a fluid caused by the presence of sound waves.
scattering loss
5.40 scattering loss. That part of the transmission loss caused by scattering within the medium or due to roughness or geometry of a reflective surface. Unit, decibel (dB).
refraction loss
5.39 refraction loss. That part of the transmission loss due to refraction resulting from nonuniformity of the medium. Unit, decibel (dB). Annotation See also 9.27.
spreading loss
5.38 divergence loss; spreading loss. That part of the transmission loss resulting from divergence of sound waves in accordance with the geometry of the system (e.g., spherical waves emitted by a point source). Unit, decibel (dB). Annotation For spherical waves, time-mean-square sound pressure varies inversely as the square of distance from the source; for cylindrical waves, time-mean-square sound pressure varies inversely as distance from the source.
divergence loss
5.38 divergence loss; spreading loss. That part of the transmission loss resulting from divergence of sound waves in accordance with the geometry of the system (e.g., spherical waves emitted by a point source). Unit, decibel (dB). Annotation For spherical waves, time-mean-square sound pressure varies inversely as the square of distance from the source; for cylindrical waves, time-mean-square sound pressure varies inversely as distance from the source.