An Improved Apparatus for Supersonic Velocity and Absorption Measurements

Abstract

The value and uses of supersonic velocity and absorption measurements are reviewed, and evidence that sound velocity measurements may still be used for heat capacity determinations is presented. An apparatus which is designed for (1) a general study of acoustical dispersion, and (2) the supersonic measurement of gaseous heat capacities. The general experimental technique to be used with such an apparatus is outlined, and results of measurements of the velocity of sound in air and of the heat capacity of propylene are briefly discussed.

Acoustic attenuation in gas mixtures with nitrogen: Experimental data and calculations

“…Our objective in this research was twofold. First we used an experimental apparatus similar to that used previously, 14 but incorporating modern transducers and electronics technology, to accurately measure acoustic attenuation in gas mixtures. Second, we compare our experimental results with previous results and our model results to further validate our model.…”

Ultrasonics research and the properties of matter

“…These terms are all small in mixtures of isotopes or atoms of nearly equal masses. Telfair (1942) used ultrasonic measurements to determine the heat capacity of propylene.…”

Experimental ideal gas reference state heat capacities of gases and vapors

“…Gas-phase heat capacities have been measured directly by the steady-state flow calorimetry technique (8-10) and indirectly by adiabatic expansion methods (11)(12)(13)(14). Methods based on measurement of the speed of sound through gases 0021-9568/90/1735-0001 $02.50/0 are included in the latter category because the rarefactions and compressions accompanying a pressure wave occur nearly adiabatically.…”