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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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.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0000890393&origin=inward; http://dx.doi.org/10.1103/physrevb.29.4951; https://link.aps.org/doi/10.1103/PhysRevB.29.4951; http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.29.4951/fulltext; http://link.aps.org/article/10.1103/PhysRevB.29.4951
American Physical Society (APS)
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