Superconductor

A superconductor is a material that can conduct electricity without any resistance when it is cooled below a certain temperature. This means electrical current can flow through it endlessly without losing energy as heat. Superconductors also expel magnetic fields, a phenomenon called the Meissner effect. They are used in advanced technologies like MRI machines, maglev trains, and particle accelerators due to their efficiency and unique magnetic properties. However, most superconductors require very low temperatures to work, making their practical use sometimes challenging and costly.