Superfluidity is the characteristic property of a fluid with zero viscosity which therefore flows without any loss of kinetic energy. When stirred, a superfluid forms vortices that continue to rotate indefinitely.

Superfluidity is a phenomenon that occurs when a fluid is cooled to extremely low temperatures, close to absolute zero (-273.15°C or -459.67°F), and it loses all its viscosity. This means that the fluid can flow without any resistance, which allows it to exhibit some amazing properties.

When chilled to below about 2 K, large numbers of the atoms can occupy the lowest energy (ground) state. When this happens, the atoms form a superfluid. Superfluids can flow uphill and through very small openings, they conduct heat very efficiently, and will not boil like conventional liquids.

A superfluid is a phase of matter that only certain liquids or gases can assume, if they are cooled to extremely low temperatures. At temperatures approaching absolute zero, atoms cease their individual, energetic trajectories, and start to move collectively as one wave.

Superfluids are a type of fluid that has zero viscosity and zero friction, and therefore flows without losing kinetic energy. They can be made relatively easily from bosons of the helium-4 isotope, which, when cooled to just above absolute zero, slow down enough to overlap and form a high-density cluster of atoms that act as one 'super-atom'.