absorption coefficient : Spreety TV Online Glossary
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absorption coefficient n. The rate at which a
material absorbs, rather than reflects, sound waves expressed as the fraction
of the sound energy that is absorbed where a higher absorption coefficient
means better acoustical damping. The absorption coefficient is a function of
both the structure of the material and the frequency of the sound. A
coefficient of 1.0 implies 100% sound absorption, such as from an open window,
while 0.0 implies 100% sound reflection.
|
Material
(1 square meter)
|
Sound Frequency (Hz)
|
|
125
|
250
|
500
|
1,000
|
2,000
|
4,000
|
|
Acoustic Panel
|
0.15
|
0.30
|
0.75
|
0.85
|
0.75
|
0.40
|
|
Brick
|
0.024
|
0.024
|
0.03
|
0.04
|
0.05
|
0.07
|
|
Carpet
|
0.05
|
0.10
|
0.20
|
0.25
|
0.30
|
0.35
|
|
Concrete
|
0.01
|
0.01
|
0.02
|
0.02
|
0.02
|
0.03
|
|
Curtains
|
0.05
|
0.12
|
0.15
|
0.27
|
0.37
|
0.50
|
|
4″ Fiberglass
|
0.38
|
0.89
|
0.96
|
0.98
|
0.81
|
0.87
|
|
Wood Floor (joists)
|
0.15
|
0.20
|
0.10
|
0.10
|
0.10
|
0.05
|
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