Design and technology as well as science teachers are buying the amazing ferrofluid - a truly magnetic liquid. This consists of micron size magnetic particles (magnetite) in a mineral oil. Particles are coated in a surfactant which prevents them clumping together. When a magnet is in close proximity the magnetic particles in the Ferrofluid take up the shape of the magnetic field - a 3D version of the classic iron filings on a piece of paper experiment that we used to do in schools. The apparent density of ferrofluid can be changed by applying a magnetic field - place a one pence piece in a shallow dish (5mm) of ferrofluid and it will sink. Bring a powerful magnet underneath and the coin will float!
- Supplied in a plastic jar containing 10mL of Ferrofluid
- A rare earth magnet is also supplied
- Requires scissors, sticky tape and pliers (or similar)