#Dynamic viscosity unit free#

Laminar shear, the non-constant gradient, is a result of the geometry the fluid is flowing through (e.g. A viscous glue called birdlime was made from mistletoe berries and used for lime-twigs to catch birds. The word 'viscosity' is derived from the Latin ' viscum alba', which means white mistletoe. 6.1.2 Effect of temperature on the viscosity of a gas.

#Dynamic viscosity unit free#

6.1.1 Relation to mean free path of diffusing particles.The study of flowing matter is known as rheology, which includes viscosity and related concepts. 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.ДЄll 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. 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). 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' or 'internal friction'. Viscosity is a measure of the resistance of a fluid which is being deformed by either shear stress or tensile stress.