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This question has is indeed a little bit on the philosophical side (or perhaps this answer is!) It is much easier (and probably scientifically more accurate) to state when a system is not BCS Cooper-paired than it is to say when it is. We can say that we have evidence that a material is a BCS-type superconductor, but we cannot say it is one with 100% ...


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EDIT: replaced "fluid" with "liquid", thanks to Kyle. I am not aware of any material with a liquid phase in near-vacuum. Probably, the liquid would evaporate and maybe a part of it freezes solid due to evaporation cooling. EDIT: NeuroFuzzy pointed to a youtube video containing an ionic liquid, which is able to retain liquidity in very near vacuum. What ...


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Viscosity is necessary in order for the wing to generate lift. Without the change in circulation caused by flow separation from the trailing edge, there will be no lift. In an inviscid fluid there will be no separation, and hence no lift. A similar flow pattern can be observed in viscous fluids when the Reynolds number is extremely low (Re<<1), and you ...


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Presumably superfluid is still largely incompressible under small pressure, so it obeys Bernoulli's principle. With the normal shape of the wing, it will still generate lifts due to the pressure difference between the top and bottom wing surfaces.


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It is known from the tunneling of Cooper pairs through Josephson junctions / Squids that there are excitations in superconductors that (a) have charge exactly 2 electron charges and (b) are in a condensate. Thus, examining the oscillations in an AC Squid establishes that there are Cooper Pairs. It does not tell us about the symmetry or similar but does ...



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