  In the previous paper (Attard 2022d)on the fountain pressure in superfluid
helium, it was shown that the experimentally confirmed expression of H. London
(1939) was thermodynamically equivalent to equality of chemical potential.
However this theoretical equivalence was not reflected in the experimental
data. The problem has now been traced to errors in the enthalpy and entropy
derived from the measured heat capacity by Donnelly and Barenghi (1998). In
this paper the corrected thermodynamic data yields almost exact agreement
between the two expressions and the measured fountain pressure. A physical
explanation is given for energy minimization as the principle that drives the
fountain effect and superfluid flow more generally.
