liquidhelium
Liquidhelium is the liquid form of the element helium, a noble gas. It is colorless, odorless, non-toxic, and chemically inert. Commercial liquid helium is predominantly helium-4, with smaller amounts of helium-3 used for specialized research.
At standard atmospheric pressure, helium-4 becomes a liquid at about 4.2 kelvin, while helium-3 liquefies at
A defining property of liquid helium is its quantum behavior. Helium-4 becomes a superfluid (He II) below
Liquid helium has a very low boiling point and a small latent heat of vaporization. It expands
Production and supply mainly rely on extraction from natural gas fields, where helium accumulates as a byproduct.
Applications include cooling superconducting magnets in MRI and NMR systems, particle accelerators, and cryogenic research. Liquid