Sound Absorption Coefficient
The practical unit between 0 and 1 expressing the absorbing efficiency of a material. It is determined experimentally.
ASTM C384 Impedance and Absorption of Acoustical Materials by the Impedance Tube Method
ASTM C423 Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method
ASTM E 795 Standard practices for mounting specimens during sound absorption tests
ASTM E1050 Impedance and Absorption of Acoustical Materials Using a Tube, Two Microphones, and a Digital Frequency Analysis System
Subjects: Noise & Vibration