<![CDATA[#Superfluidity is the characteristic property of a fluid with zero viscosity which therefore flows without any loss of kinetic energy.]]> 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 occurs in two isotopes of helium (helium-3 and 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.[1]

https://en.wikipedia.org/wiki/Superfluidity

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