IEVref: 801-31-09 ID: Language: en Status: Standard Term: Eyring absorption coefficient Synonym1: Synonym2: Synonym3: Symbol: Definition: sound power absorption coefficient attributed to a surface by the Eyring reverberation-time equation NOTE – The Eyring reverberation-time equation is: $T=\frac{\left(24\text{\hspace{0.17em}}\text{ln}\text{\hspace{0.17em}}10\right)\text{\hspace{0.17em}}V}{-cS\text{\hspace{0.17em}}\text{\hspace{0.17em}}\text{ln}\text{\hspace{0.17em}}\left(1-\overline{\alpha }\right)}$ where: T is the reverberation time V is the volume of the room c is the speed of sound in the contained air S = Σ Si is the total area of surfaces of the room $\overline{\alpha }=\text{Σ}{S}_{i}{\alpha }_{i}/S$ is the area-weighted mean Eyring coefficient of all the surfaces Si is the area of the i-th surface αi is Eyring sound power absorption coefficient attributed to the i-th surface. The equivalent absorption area of the i-th surface is Siαi. Publication date: 1994-07 Source: Replaces: Internal notes: 2017-06-02: Cleanup - Remove Attached Image 801-31-091.gif 2017-06-02: Cleanup - Remove Attached Image 801-31-092.gif CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: