👉 A quantum fluid is a state of matter that exhibits properties of both a fluid and a quantum system, typically found at extremely low temperatures near absolute zero. Unlike classical fluids, which are composed of particles moving randomly, quantum fluids are made up of particles that obey the principles of quantum mechanics, such as superposition and entanglement. These particles can exhibit collective behaviors like superfluidity, where they flow without viscosity, and quantized vortices, where the circulation around a vortex is an integer multiple of Planck's constant divided by the particle mass. This unique behavior arises from the quantum mechanical nature of the particles, leading to phenomena that defy classical physics explanations.