Theories of superfluidity

Superfluidity is a phase of certain liquids, like helium-4 at very low temperatures, where they flow without any viscosity or resistance. Theories explaining this phenomenon often describe how quantum mechanics causes particles to become correlated and act collectively, forming a "condensate" where they move in unison. This collective behavior emerges because particles follow quantum rules, leading to properties like zero friction and the ability to flow endlessly in a loop. In essence, superfluidity arises when quantum effects dominate, creating a unique state of matter with remarkable fluid properties.