Superfluidity is a
state of matter in which the
matter behaves like a fluid with zero
viscosity; where it appears to exhibit the ability to self-propel and travel in a way that defies the forces of
gravity and
surface tension. Superfluidity is found in astrophysics, high-energy physics, and theories of
quantum gravity. The phenomenon is related to
Bose–Einstein condensation, but neither is a specific type of the other: not all Bose-Einstein condensates can be regarded as superfluids, and not all superfluids are Bose–Einstein condensates.