“…The rules are related to the lengths, time, and frequency, but also to the absorption of sound in the fluid (air) filling the model and full scale. Thus, the air absorption in the model, α m , should be S times greater (S is the scale factor) than the absorption in the full scale, α, at the corresponding frequencies, f , (Xiang, Blauert, 1993;Polack et al, 1989) α m (Sf ) = Sα(f ).…”