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'Quantum hydrodynamics' is more than the study of superfluidity. Some of the main subjects in quantum hydrodynamics are quantum turbulence, quantized vortices, first, second and third sound, and quantum solvents. The quantum hydrodynamic equation is an equation in Bohmian mechanics, which, it turns out, has a mathematical relationship to classical fluid dynamics. This is a rich theoretical field.
However, the most common experimental applications of these studies are in liquid helium (He-3 and He-4), and of the interior of neutron stars and the quark-gluon plasma. Many famous scientists have worked in quantum hydrodynamics, including Richard Feynman, Lev Landau, and Pyotr L. Kapitsa.