Magnetic levitation is a method by which an object is suspended with no support other than magnetic fields. A substance that is diamagnetic repels a magnetic field and in theory can be subject of magnetic levitation. However, although all materials have diamagnetic properties, the effect is very weak. Superconductivity is an electrical resistance of exactly zero which occurs in certain materials below a characteristic temperature. Superconductors may be considered perfect diamagnets what give them the property of completely expelling magnetic fields and therefore inducing magnetic levitation...
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