What are Superconductors

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Superconductors are amazing materials whose resistance drops to zero when cooled. In other words, very efficient conductors. Commonly used superconducting materials are complex metal oxides (of, for example, yittrium, barium copper oxide) and they typically become superconducting when cooled below around -180 degrees Centigrade. Cooling can be achieved using liquid nitrogen which is cheaply available.  more...