Quantum hydrodynamics
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Quantum hydrodynamics is the study of superfluidity. Some of the main subjects in quantum hydrodynamics are quantum turbulence, quantized vortices, first second and third sound. The most common examples are liquid Helium (He-3 and He-4) and is also believed to exist in the interior of neutron stars. Many famous scientists have worked in quantum hydrodynamics such as Richard Feynman, Lev Landau, and Pyotr L. Kapitsa.