Journal of Low Temperature Physics

, Volume 68, Issue 5–6, pp 409–417 | Cite as

Precision second-sound velocity measurements in helium II

  • Rabi T. Wang
  • William T. Wagner
  • Russell J. Donnelly


The velocity of second soundu2 in helium II under its saturated vapor pressure was measured in an acoustic resonator with a typical precision of 0.07% and was found to agree with existing measurements. Data were taken from 1.135 to 2.09 K, with special attention given to the local maximum near 1.65 K, which can be used as a temperature reference point. A least squares cubic spline fit is given to the present data and selected data of other authors givingu2 from 0.55 K to within 60 µK of Tλ.


Helium Vapor Pressure Reference Point Magnetic Material Local Maximum 
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Copyright information

© Plenum Publishing Corporation 1987

Authors and Affiliations

  • Rabi T. Wang
    • 1
  • William T. Wagner
    • 1
  • Russell J. Donnelly
    • 1
  1. 1.Department of PhysicsUniversity of OregonEugene

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