superfluidity
superfluidity Property of a liquid that has no viscosity and therefore no resistance to flow. Helium II – liquid helium at temperatures less than 2K (−271°C/−456°F) – was the first known superfluid. Helium II apparently defies gravity by flowing up slopes. It also appears to contravene the laws of thermodynamics, by flowing from a cool region to a warmer one. See also cryogenics
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superfluidity