An open window is an example of 100% sound absorption i.e. no reflection, whereas bathrooms usually have sound reflective surfaces and therefore very low sound absorption properties, resulting in multiple reflections in the room and a diffused sound field.
Sound Absorption Definition (ASA 10.01) at a specified frequency or specified frequency band, property of a material or an object whereby sound energy is converted into heat by propagation in a medium or when sound strikes the boundary between two media.
Sound Absorption Related Terms - listed alphabetically
Sound Absorption Coefficient is also known as the sabine absorption coefficient
Absorption Coefficient - under sound absorption coefficient
Equivalent Sound Absorption Area (A), is the sound absorber or soft furnishings, etc., required to produce the required reverberation time in a room.
Equivalent Absorption Area of an Object or of a Surface Definition (IEC 801-31-06) area of a surface having a sound power absorption coefficient of unity that would absorb the same amount of sound power in a reverberant room with a diffuse sound field as the object or the surface. In the case of a surface, the equivalent absorption area is the product of the area of the surface and its sound power absorption coefficient
Passive Sound Absorbers dissipate sound energy as heat.
One square metre of 100% sound absorbing material has a value of 1 metric sabin.
One square foot of 100% sound absorbing material has a value of 1 imperial sabin.
Sabine Absorption Definition (IEC 801-31-10) sound absorption defined by the Sabine reverberation-time equation The unit of Sabine absorption is the decibel metre-squared, sometimes known as the metric sabin.
Sabine Absorption Coefficient Definition (IEC 801-31-12) quotient of Sabine absorption of a surface by the area of the surface. Is also known as the sound absorption coefficient
Note : with αi as the Sabine absorption coefficient of the i-th surface whose area is Si, the Sabine absorption attributed to the surface is Ai = Siαi.
Sabine Reverberation-time Equation under reverberation time
Sound Absorbers for use in buildings are ranked A to E, as specified in BS EN ISO 11654.
Sound Reduction Coefficient under noise reduction coefficient