The behavior of liquid helium is so unusual that it is not unreasonable to consider it the only representative of a fourth state of matter; helium gas condenses not into the liquid state, but rather into the quantum liquid state. Liquid helium is thus unique in low temperature physics; it is important both in the techniques of producing low temperatures and for its peculiar properties.
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© 1948 American Institute of Physics.
1948
American Institute of Physics
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