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单词 open window unit
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open window unit
open window unit n. Acoustics (now rare) = sabin n.
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the world > matter > physics > science of sound > [noun] > unit of sound absorption
open window unit1900
sabin1934
1900 W. C. Sabine in Amer. Architect & Building News 21 Apr. 22/1 The absorbing power was found to be ·73 of open-window units.
1957 D. H. Fender Gen. Physics & Sound xii. 398 The area of material multiplied by its absorption coefficient measures its total absorption in ‘open window units’.
1968 R. C. Stanley Light & Sound for Engineers xvi. 308 If the area of the surface is expressed in square feet, then the absorption is expressed in open window units or sabins.
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