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Cooled below two Kelvin liquid helium loses all viscosity climbing container walls. 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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Superfluid liquid helium flows uphill without friction

Cooled below two Kelvin liquid helium loses all viscosity climbing container walls

When liquid helium-4 is cooled below roughly two Kelvin, it undergoes a quantum transition into a superfluid state known as helium II. In this state, the liquid exhibits zero viscosity and infinite thermal conductivity, flowing effortlessly through microscopic pores. Superfluid helium forms a thin film that creeps up and over container walls in defiance of gravity.

Liquid Helium photograph — Alfred Leitner photographed this as part of his movie "Liquid Helium, Superfluid". · Public domain · source

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NIST

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Tags: materials, superfluid, helium

Superfluid liquid helium flows uphill without friction: the short answers

Where does this come from, and can I check it?: Cooled below two Kelvin liquid helium loses all viscosity climbing container walls. 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.