Definitions for "Ferrofluid"
A liquid containing magnetic particles in which the moving parts of a bass/mid/treble drive unit.are submersed to provide cooling of the voice coil and damping.
a colloidal suspension of magnetic nanoparticles in a carrier liquid
a fluid with magnetic particles in it, and if the fluid is exposed to a magnetic field, all the magnetic particles will align with the field lines, and making the fluid much more dense