Quantum fluid

A quantum fluid can refer to a cluster of valence electrons moving together after they undergo fermionic condensation.

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Under extremely high pressures and low temperatures electrons may condense into a quantum fluid. In such a state, electrical current can theoretically flow forever with a complete absence of voltage.

Quantum fluids exhibit the remarkable property of remaining liquid at absolute zero temperature and zero pressure. This effect arises from their large zero-point energy and the small interatomic forces, both of which prevent the formation of a solid phase.

A quantum fluid can also refer to a superfluid (made up of atoms).

References

1. Lerner, Rita G. and Trigg, George L. (1990). Encyclopedia of Physics. VHC Publishers. 0-89573-752-3.