Abstract

Measurements of the entropy of liquid 4He between 0.7 and 1.35 K have been performed at pressures of 1, 5, 10, 15, 20 and 24 bar, with the help of the fountain pressure effect. A differential manometer, operated at low temperature and calibrated in situ, has been used to achieve an accuracy of ≈ 1% in the entropy.

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