Main Page | See live article | Alphabetical index Helium never crystallizes at the normal 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. This article is a stub. You can help Wikipedia by fixing it. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.