sabin

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(n.) A unit of sound absorption used in acoustical engineering. One sabin is the sound absorption of one square foot of a perfectly absorbing surface, like an open window. The sound absorption of a wall or some other surface is the area of the surface, in square feet, multiplied by a coefficient that depends on the density of the surface and on the frequency of the sound. The unit is named for Wallace Sabine, who applied it in acoustical measurements in 1911.