superfluid
Fluid that flows without viscosity or friction and has a very high thermal conductivity. Liquid helium at temperatures below 2 K (−271°C/−456°F) is a superfluid: it shows unexpected behaviour. For instance, it flows uphill in apparent defiance of gravity and, if placed in a container, will flow up the sides and escape.
German physicists discovered in 1998 that as few as 60 atoms will exhibit superfluidity.
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