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superfluidity
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superfluidity

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Written by
Anthony James Leggett
John D. and Catherine T. MacArthur Professor Professor and Professor of Physics, University of Illinois at Urbana-Champaign. Winner of 2003 Nobel Prize for Physics. Author of The Problems of Physics...
Anthony James Leggett
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superfluidity, the frictionless flow and other exotic behaviour observed in liquid helium at temperatures near absolute zero (−273.15 °C, or −459.67 °F), and (less widely used) similar frictionless behaviour of electrons in a superconducting solid. In each case the unusual behaviour arises from quantum mechanical effects. The stable isotopes of helium are helium-3 (or 3He), with two protons and one neutron, and helium-4 (or 4He), with two protons and two neutrons. 4He forms the bulk of naturally occurring helium, but the lighter isotope 3He has been formed, since about 1950, in experimentally useful quantities by the decay of tritium produced ...(100 of 1537 words)

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