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Weak interatomic forces and high quantum zero-point motion prevent helium from freezing. The figure is taken from NIST, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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Helium remains liquid at absolute zero under normal pressure

Weak interatomic forces and high quantum zero-point motion prevent helium from freezing

Helium is the only element that does not solidify under normal atmospheric pressure even when cooled to absolute zero. Because helium atoms are light and possess extremely weak interatomic attraction, quantum mechanical zero-point vibrations keep them fluid. Solidifying helium requires applying at least 25 atmospheres of mechanical pressure.

Liquid helium Rollin film — I, AlfredLeitner, took this photograph as part of my movie "Liquid Helium,Superfluid" · Public domain · source

Where this comes from

NIST

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Tags: chemistry, helium, elements

Helium remains liquid at absolute zero under normal pressure: the short answers

Where does this come from, and can I check it?: Weak interatomic forces and high quantum zero-point motion prevent helium from freezing. The figure is taken from NIST, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a science fact?: Yes. It sits on the Science shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.