A Liquid Can Flow Without Friction

At extremely low temperatures, superfluid helium can flow with essentially zero viscosity and display quantum behavior on a visible laboratory scale. It challenges the everyday intuition that every fluid must lose energy to friction. Editorial note: 'without friction' describes a special quantum state under controlled conditions, not ordinary liquids flowing through the world without resistance. Evidence status: ESTABLISHED Sources: • National Institute of Standards and Technology — https://www.nist.gov/pml/quantum-physics • CERN — https://home.cern/science/physics/quantum-mechanics Visual disclosure: AI-assisted cinematic reconstructions illustrate low-temperature quantum physics; they are not a substitute for laboratory measurement. NOCTICOSM — Science at the Edge of Reality. #Superfluid #QuantumPhysics #Physics #LowTemperature #Science #NOCTICOSM