What is another word for liquid helium?
Pronunciation: [lˈɪkwɪd hˈiːli͡əm] (IPA) 
Liquid helium is an exotic substance that has unique properties, such as the ability to flow against gravity and to become a superfluid at low temperatures. There are several synonyms for liquid helium, including cryogenic helium, liquid He, He II, and superfluid helium. Cryogenic helium refers to the low temperature at which helium becomes liquid, while liquid He and He II are common abbreviations for liquid helium. Superfluid helium refers specifically to the state of matter when helium is cooled to a temperature below 2.17 kelvin, allowing it to flow without any friction. These synonyms are often used interchangeably in scientific literature and research.
