THE ABSORPTION OF SOUND IN GAS MIXTURES
CALIFORNIA UNIV LOS ANGELES
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The molecular absorption of sound in CO sub 2, CS sub 2, C sub 2 H sub 4 O, and their mixtures were measured. The sound tube method used in this investigation was readily adaptable to both frequency and pressure control. The attenuations for pure CO sub 2, CS sub 2, and C sub 2 H sub 4 O agreed closely with the attenuations predicted by Bourgins theory for a single gas. The attenuation for mixtures of CO sub 2 and CS sub 2 agreed within 2 to 5 of the theoretically predicted values, and within less than 2 for the CO sub 2 - C sub 2 H sub 4 O mixture. Information was also obtained concerning the collision parameters of a gas or gas mixture. For example, the number of collisions required to remove a quantum of vibrational energy from a molecule and the probablity of a transition occurring because of a single collision can be calculated from experimentally determined transition rates.