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In page State of matter:

"

In 1937, it was discovered that helium-4, the most common isotope of helium, forms a superfluid below the lambda temperature of 2.17 K (−270.98 °C; −455.76 °F). The state is described as superfluid because it has zero viscosity and flows without friction. In this state it will attempt to "climb" out of its container.[3] It also has infinite thermal conductivity so that no temperature gradient can form in a superfluid. Placing a superfluid in a spinning container will result in quantized vortices. These properties are explained by the theory that helium-4 atoms form a Bose–Einstein condensate in the superfluid state.[citation needed]