Speed of Sound in Fluid Parahydrogen

This paper presents measurements of speed of sound in compressed fluid parahydrogen. The measurements cover temperatures from 15 to 100°K and pressures to 300 atm. Calculations based on previous pressure, density, and temperature measurements of this laboratory provide the density corresponding to each experimental temperature and pressure. These measurements complement previous thermodynamic data on parahydrogen of this laboratory, giving extensive verification of sound-speed calculations based on those measurements. Prior to this work, no known experimental speeds had been determined for compressed liquid parahydrogen above 21°K.

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