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Entropy of He II from 1.6 K to the line

Physical Review B, ISSN: 0163-1829, Vol: 29, Issue: 9, Page: 4951-4960
1984
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Metrics Details

  • Citations
    38
    • Citation Indexes
      38
  • Captures
    2

Article Description

The fountain pressure of He II was measured and the results were used to obtain the entropy from 1.6 K to near T at vapor pressure and from 1.7 K to near T at various pressures up to 29 bar. The data have a precision of 0.1% and an accuracy of 0.5%. There is excellent agreement with recent calorimetric measurements at vapor pressure and good agreement within the combined error estimates with some, but not all, previous fountain-pressure measurements. The small quantity S=T0T(CpT)dT was added to our measurements near T to yield values for S(P) which were fitted to an empirical equation with a scatter of 0.1%. The increased accuracy of our new measurements will reduce considerably the experimental errors in the determination of the superfluid fraction from the second-sound velocity near the superfluid transition line. © 1984 The American Physical Society.

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