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"Leaping ferrofluid." When a column of small magnets is lowered inside a tube that is positioned above a puddle of ferrofluid, the ferrofluid will leap toward the magnet, coating the outside of the tube and exhibiting characteristic spikes. If the column of magnets is subsequently raised inside the tube, the ferrofluid will follow upward on the outside of the tube until it reaches a rubber stopper, which causes it to fall back down into its original watchglass container. The outside of the tube has been previously treated with a ferrofluid-resistant film to minimize the amount of ferrofluid that will stick to the tube. (JCE)
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