Superconductor classification

When materials are very cold, some of them have special characteristics where electricity can flow through them without any resistance. That's what is called a superconductor. Superconductors can be classified into different types or classes, depending on the type of material and how it behaves when it's very cold. For example, some superconductors need to be cooled with liquid nitrogen, others use liquid helium, and some require extra strong magnets. Each superconductor's class can tell you how to use it and how cold it needs to be to work.