Sound velocity measurements in liquid argon, oxygen and nitrogen

Brillouin Scattering in Simple Liquids: Argon and Neon

“…2% about the velocity values quoted in Ref. 15. At some temperatures, our Brillouin data are only about 0.…”

“…(15) and (16). As mentioned above, the experimental error precludes our drawing quantitative conclusions from the comparison of ultrasonic data and hypersound velocities in liquid argon.…”

“…2%. Of primary interest in these experiments is a comparison of the hypersonic (-2-3 GHz) velocities measured here with those at much lower frequencies 15 (~ 1 MHz), obtained by conventional ultrasonic techniques to determine the presence or absence of velocity dispersion. The comparison is illustrated in Fig.…”

“…c i ass ~10" 4 ) follows from Eq. (15). This behavior is due to the fact that the nondissipative part of the transport coefficients is an odd function of the frequency, i. e., in the low-frequency range and to the lowest order, r"/r°~ 0(o/co c ), which is multiplied by (r°k s /vQ) to give the first dispersive term to the hypersonic velocity -while the lowest-order correction to the attenuation is just the second significant term of the expansion of the real part of the transport function, which is even in the frequency, i.e.,…”

CHAPTER 12. Ultrasonics 1: Speed of Ultrasound, Isentropic Compressibility and Related Properties of Liquids

“…Van Dael et al81 measured the sound speed in saturated liquid oxygen covering the range between 61.14 K and 153.88 K. In a continuing effort to generate accurate thermodynamic and transport properties of cryogenic fluids, Straty and Younglove 82 measured the ultrasound speed in saturated liquid oxygen from 58 K to 150 K and in compressed fluid oxygen along isotherms from 70 K to 300 K at pressures up to 34 MPa. Using previously measured PrT data, isentropic compressibilities and heat capacity ratios were calculated.Abramson et al83 measured the speed of sound in supercritical fluid oxygen up to the freezing points of 6.27 GPa at 303.15 K and 10.74 GPa at 473.15 K. The oxygen was contained in a diamond anvil cell and pressure was measured on the ruby scale.…”