In this paper, simulation of the sound attenuation caused by air absorption is studied as to acoustic scale model experiment of room acoustics. Examining the data of sound absorption by air published up to this time and measured by the authors, it is found that in 1/10 scale model experiment the sound absorption by air under normal room condition can be simulated by excluding the molecular absorption of air and reducing the absorption by experimental medium gas to the value of the classical absorption of air. Thus, N2-substitution method proved useful for simulation.
