Velocity of sound in liquid and solid helium.
Jordan, Robert D.
Neighbours, John R.
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The measurements of the velocity of sound in liquid and solid helium reported here were made as a part of a more comprehensive study to determine the elastic properties of substances at very low temperatures. The equipment described is capable of measuring velocities of sound as a function of temperature and pressure for temperatures between one and four degrees K and pressures between one and 80 atmospheres. The velocities in the liquid compare well with other published values. No previous measurements of velocity of sound in solid helium have been made. The three values for the velocity in solid helium obtained here are 404 meters per second at 1.54˚ K and 28.6 atm, and 488 meters per second at 2.50˚ K and 62.2 atm.
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