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We all know that helium in its gaseous form is lighter than air — it fills our balloons and makes our voices squeak. Did you know that it has anti-gravitational properties when it’s in liquid form too? Supercooled helium has two different liquid forms.
The first kind, Helium 1, happens between -455 and -452 degrees Fahrenheit, where it is almost impossible to see. The second type happens when it gets colder than 2.18 Kelvin and that is when things get weird.
Helium supercooled below 2.18K stops obeying the laws of gravity. It turns into a superfluid that can climb up the walls and out of its container. Supercooled helium is as close to a frictionless material as we’ve discovered thus far.