Superfluidity

Superfluidity is the characteristic property of a fluid with zero viscosity which therefore flows without any loss of kinetic energy. When stirred, asuperfluid forms vortices that continue to rotate indefinitely.
Superfluidity occurs in two isotopes of helium (helium-3and helium-4) when they are liquefied by cooling to cryogenic temperatures. It is also a property of various other exotic states of matter theorized to exist in astrophysics, high-energy physics, and theories of quantum gravity.The theory of superfluidity was developed by Soviet physicist Lev Landau.

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