Superfluid

A Superfluid is a type of matter that exists at a low energy state. It is a type of liquid that has zero viscosity. It is exists when liquid has been exposed to the temperatures near Absolute zero. At this temperature, the liquid can flow continuously. While it flows, it can defy gravity. For example, a superfluid in a cup can flow immediately out of the cup and reach the bottom of the cup.

Superfluidity is a trait that is present in liquid helium.

It is speculated that superfluid liquid exists within a Neutron star. Beneath the solid surface of the Neutron star is a thin layer of superfluid liquid that is near the core.