Abstract
The density of He II in supercritical, superfluid flow has been measured by a sensitive capacitance technique in the temperature range from 1.3 to 1.8 K. The average density of the liquid decreased with increasing superfluid velocity. The largest fractional density change observed was $\frac{\ensuremath{\Delta}\overline{\ensuremath{\rho}}}{\ensuremath{\rho}}=\ensuremath{-}9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ at a velocity of 7.75 cm/sec. The results can be accounted for adequately by the two-fluid, thermohydrodynamic equations of motion utilizing the expressions for the nonlinear, superfluid dissipation force and the mutual friction force.
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