Superfluidity is an example of Bose–Einstein condensation and not all superfluids are Bose–Einstein condensates. It is the property that is exhibited by a fluid with no or zero viscosity. This means that there is no loss of kinetic energy and in theory, a superconductive fluid will rotate indefinitely when stirred within a container. The two isotopes in which superfluidity occurs are in helium-3 and helium-4. These isotopes attain superconductivity when they are liquefied to cryogenic temperatures. It was Pyotr Kapitsa and John F. Allen that first discovered the concept of superfluidity and the discovery of superfluidity in helium-3 was the basis for the award of the 1996 Nobel Prize in Physics. Arkady Migdal was the first who proposed an idea that superfluidity could exists a neutron star also.
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