At low temperature, fluids {superfluid}| can have no viscous resistance. Liquid helium is the only known superfluid. Vortexes but no overall rotation can appear in spun superfluids. Space-time can be like fluid, and black-hole event horizon can be like superfluid with quantum-phase transition. General relativity has same equations as sound waves in moving fluid.
Physical Sciences>Physics>Heat>Cryogenics
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Date Modified: 2022.0224