Individual #fluid_mechanics__fluidmechanic__hydraulics  study of the mechanics of fluids
  >part of:  #mechanics__mechanic  the branch of physics concerned with the motion of bodies in a frame of reference
  >part:  #hydrostatics  study of the mechanical properties of fluids that are not in motion
  >part:  #hydrodynamics__hydrodynamic__hydrokinetics__hydrokinetic  study of fluids in motion
     >part:  #magnetohydrodynamics  the study of the interaction of magnetic fields and electrically conducting fluids (as plasma or molten metal)

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