Superfluid helium-4
= Superfluid helium-4
{wiki=Superfluid_helium-4}
Superfluid helium-4 is a phase of helium-4, a stable isotope of helium, that occurs at very low temperatures, typically below 2.17 Kelvin (-270.98 degrees Celsius). In this superfluid state, helium-4 exhibits remarkable and counterintuitive properties that differ significantly from those of normal fluids.