Abstract
The characteristics of sound propagation in rarefied gases are given in terms of attenuation and phase parameters. Experimental values of the attenuation and phase were determined in the frequency range from 2 to 16 kc and at pressures as low as 6×10−5 mm Hg. The experimental results are compared with free-molecule theory. The dependence of the attenuation and phase on the spacing between transmitter and receiver are discussed. Areas of disagreement between theory and experiments are particularly emphasized. [This research has been supported by the Office of Naval Research.]
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