Individual #fluid_mechanics__fluidmechanic__hydraulics  study of the mechanics of fluids
  >part:  hydrostatics  hydrodynamics
  >part of:  mechanics__mechanic  the branch of physics concerned with the motion of bodies in a frame of reference
     >part of:  physics__physic__physical_science__natural_philosophy__naturalphilosophy  the science of matter and energy and their interactions

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