Thickness of a Rotating Liquid-Helium Film

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Abstract
The thickness of a rotating liquid-helium film has been measured at various angular velocities and temperatures. The results are consistent with hydrodynamical calculations assuming that the superfluid component remains at rest and that the normal component alone rotates. The failure to induce rotation in the superfluid component is interpreted as evidence that vortex lines with their axes perpendicular to the film are difficult to create.

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