A liquid magnet or ferrofluid (from video description) is a colloidal mixture of magnetic particles (~10 nm in diameter) in a liquid carrier. The carrier contains a surfactant to prevent the particles from sticking together. Ferrofluids can be suspended in water or in an organic fluid. A typical ferrofluid is about 5% magnetic solids (magnetite, hematite or any other substance containing iron), 10% surfactant (oleic acid, citric acid, soy lecitin, etc) and 85% carrier (solvent), by volume.
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