Friction friction and wear in so-called self-lubricating materials. Fluid friction occurs between fluid layers that are moving relative to each other. This internal resistance to flow is named "viscosity". In everyday terms, the viscosity of a fluid is described as its "thickness". Thus, water is "thin", having a lower viscosity, while honey is "thick", having a higher viscosity. The less viscous the fluid, the greater its ease of deformation or movement. All real fluids (except superfluids) offer some resistance to shearing and therefore are viscous. For teaching and explanatory purposes it is helpful to use the concept of an inviscid fluid
Physics of Fluids American Physical Society in 1984 to reward a young scientist who published a paper containing significant contributions to fluid dynamics during the previous year. The award-winning paper was chosen from "Physics of Fluids" until 2016. "Physics of Fluids A", "Physics of Fluids B", and "Physics of Fluids" were ranked 3, 4, and 6, respectively based on their citation impact from 1981–2004 within the category of journals on the physics of fluids and plasmas. According to the Journal Citation Reports, in 2016, "Physics of Fluids" published 554 articles and was cited 27,962 times. "Physics of Fluids" has a 2017 impact factor