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Superfluid He IIwithout viscosity below 2.17 K : easily penetrable through the Superleak |
This video demonstrates the remarkable feature that He II passes through the Superleak instantly when the glassware is pulled up from the liquid surface of He II, which can be compared with the case of the Normal liquid He I. He II does not have the viscosity that prevents He I from rapidly penetrating the Superleak. More precisely speaking, it is well known that He II behaves as a mixture of two different kinds of fluids; normal fluid and superfluid. In this web site, we use the terminology as He I for the normal fluid and He II for the superfluid.
