👉 The Cooper fluid, named after physicist Leon Cooper, is a theoretical liquid state of matter that exists under extreme conditions of high pressure and low temperature, particularly in the cores of neutron stars. Unlike conventional fluids, it is a superfluid, meaning it flows without viscosity or resistance, allowing it to move through tiny gaps and exhibit phenomena such as the ability to climb up and over solid surfaces, known as the "fountain effect." This unique state of matter arises due to Cooper pairs—bound states of two electrons with opposite spins—forming a coherent quantum state that behaves as a single entity. The Cooper fluid is crucial in understanding the behavior of matter in the most dense environments in the universe, providing insights into the fundamental properties of quantum mechanics and the structure of neutron stars.
