Fluid friction is the friction between a solid object and a fluid (a liquid or gas) it is moving through. It happens when a solid contacts a fluid and a force is applied onto the object or fluid. The drag of air on an airplane or of water on a swimmer are two examples of fluid friction. Friction is the force that opposes the relative motion or tendency of such motion of two surfaces in contact. ... In jewelry, a solid gold piece is the alternative to gold-filled or gold-plated jewelry. ... A subset of the phases of matter, fluids include liquids, gases, plasmas and, to some extent, plastic solids. ... A liquid will assume the shape of its container. ... A gas is one of the four main phases of matter (after solid and liquid, and followed by plasma), that subsequently appear as a solid material is subjected to increasingly higher temperatures. ... A subset of the phases of matter, fluids include liquids, gases, plasmas and, to some extent, plastic solids. ... A subset of the phases of matter, fluids include liquids, gases, plasmas and, to some extent, plastic solids. ... For a solid object moving through a fluid or gas, drag is the sum of all the aerodynamic or hydrodynamic forces in the direction of the external fluid flow. ...

See skin friction, form drag and boundary layer. In Aerodynamics, skin friction is the component of parasitic drag arising from the friction of the fluid against the skin of the object that is moving through it. ... In aerodynamics, form drag, profile drag, or pressure drag, is a component of parasitic drag. ... In physics and/or fluid mechanics, the boundary layer is that layer of fluid in the immediate vicinity of a bounding surface. ...

See also

• Coanda effect