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 former continued under its original name, "Physics of Fluids". "Physics of Fluids" was originally published by the American Institute of Physics in cooperation with the American Physical Society's Division of Fluid Dynamics (APS-DFD). In 2016, the American Physical Society founded its own journal "Physical Review Fluids". From 1985–2015, "Physics of Fluids" published the "Gallery of Fluid Motion", containing award-winning photographs, images and visual streaming media of fluid flow. Since 2016, the "Gallery of Fluid Motion" is published by the American Physical Society. With funding from the American Institute of Physics the annual "François Naftali Frenkiel Award" was established by the