![]() Laminar shear, the non-constant gradient, is a result of the geometry the fluid is flowing through (e.g. The study of flowing matter is known as rheology, which includes viscosity and related concepts. All real fluids (except superfluids) have some resistance to stress and therefore are viscous, but a fluid which has no resistance to shear stress is known as an ideal fluid or inviscid fluid. ![]() For example, high-viscosity felsic magma will create a tall, steep stratovolcano, because it cannot flow far before it cools, while low-viscosity mafic lava will create a wide, shallow-sloped shield volcano. Viscosity describes a fluid's internal resistance to flow and may be thought of as a measure of fluid friction. Put simply, the less viscous the fluid is, the greater its ease of movement (fluidity).( 1) Thus, water is "thin", having a lower viscosity, while honey is "thick", having a higher viscosity. In everyday terms (and for fluids only), viscosity is "thickness". Viscosity is a measure of the resistance of a fluid which is being deformed by either shear stress or tensile stress. Clear liquid above has lower viscosity than the substance below. ![]()
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