👉 A magnet fluid, also known as a ferrofluid, is a colloidal suspension of magnetic nanoparticles in a carrier fluid, typically an oil or water-based medium. These nanoparticles align with external magnetic fields, creating a fluid that can change viscosity, flow behavior, and even form complex shapes in response to magnetic forces. This unique property makes magnet fluids useful in various applications, such as magnetic levitation, targeted drug delivery, and advanced sensors, where precise control over fluid behavior under magnetic influence is crucial.