The Liquid helium reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Liquid helium

Helium never crystallizes at standard pressure. Quantum fluctuations are strong in helium due to its low atomic weight. The interaction of helium atoms is weak since it is a noble gas. As a result, helium remains liquid even at absolute zero. When cooled to almost absolute zero, it becomes a superfluid. Superfluid helium has zero viscosity.

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