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Alternate Titles: linearly viscous fluid, Newtonian liquid, viscous fluid, viscous liquid
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amorphous solid formation
Some textbooks erroneously describe glasses as undercooled viscous liquids, but this is actually incorrect. Along the section of route 2 labeled liquid in Figure 3, it is the portion lying between T f and T g that is correctly associated with the description of the material as an undercooled liquid (undercooled meaning that its temperature is...
Fluids of which the viscosity, or internal friction, must be taken into account are called viscous fluids and are further distinguished as Newtonian fluids if the viscosity is constant for different rates of shear and does not change with time. The viscosity of non- Newtonian fluids either varies with the rate of shear or varies with time, even though the rate of shear is constant. Fluids in a...
deformation and flow
Viscous liquids consist of molecules that, like those of the perfect fluid, are in contact with one another but do exert forces on one another so that shearing motions within the liquid are resisted. These internal shearing forces produce the characteristic behaviour of liquids such as treacle, heavy oils, or molten plastics. This characteristic motion, known as shearing flow, is an...
...strain is constant for a given fluid at a fixed temperature. This constant is called the dynamic, or absolute, viscosity and often simply the viscosity. Fluids that behave in this way are called Newtonian fluids in honour of Sir Isaac Newton, who first formulated this mathematical description of viscosity.