This Standard sets out a method of measuring the sound absorption coefficient of acoustical materials used as wall or ceiling treatments, or the equivalent sound absorption area of objects such as furniture, persons, or space absorbers, in a reverberation room. It is not intended for measuring the absorption characteristics of weakly damped resonators.The results obtained, using the method outlined in this Standard, can be used for comparison purposes and for design calculation with respect to room acoustics and the reduction of the reverberant component of the sound field.