What is superconductivity?
Superconductivity is a quantum state in which some materials exhibit zero electrical resistance under suitable conditions.
How it works and what the evidence shows
Core idea Below a critical temperature and within appropriate current and magnetic-field limits, collective electron behavior changes. Expulsion of magnetic field is another characteristic property. Evidence and research Researchers measure resistance, temperature and magnetic response. Critical temperatures and fields differ between materials and depend on structure and quality.
Uses and limitations
Why it matters Applications include magnetic imaging and research magnets. Cooling, cost and manufacturing difficulty can limit broader use. Common misunderstandings Zero resistance does not create free energy; refrigeration and system losses still matter. Not every material superconducts at room conditions.