Viscosity is the measure of the shear stress vs the shear strain of the fluid (in one tensorial direction). It is a derived property of fluids and cannot be directly linked to fluid parameters.
There are typically two ways to measure fluid viscosity, test it in simple shear flow, and test it in elongation. Both tests will yield a fluids viscosity, although the results may be different.
Definition- the state of being thick, sticky, and semifluid in consistency, due to internal friction.
Let it be noted that 'viscosity' is only a term applied to newtonian fluids, because in fact some fluids do not have constant viscosity. This becomes very apparent when attempting to use the Navier Stokes equations on non-newtonian fluids. The 'viscous' closure term falls apart for these fluids. This is once again due to the fact that when you measure the 'viscosity' of a fluid, you are only measure one direction in the stress tensor, which for these fluids is not equal for all directions (seen in cases such as die swell). *See rheology for more information about this topic
Viscosity is a measure of a fluids ability to flow.
Viscosity is the measure of friction between adjacent layers of materials.
Viscosity is resistance to flow of oil Viscosity Index is a scale to measure viscosity
Viscosity doesn't happen. Viscosity is a measure of how easily a liquid flows.
The viscosity index refers to the measure of the change of viscosity with a change in temperature.
Viscosity = resistance to flow. For example, honey has high viscosity because it flows slowly, while water has a low viscosity.
Viscosity is a measure of a fluids resistance to flow. Is is a measure of how 'thick' a liquid is. For example, oil has a greater viscosity than water.
Viscosity Index measures how well a substance flows (the thickness).
Viscosity is the measure of a liquids resistance to flow. In the case of magma, the hotter it is, the lower the viscosity.
Viscosity is a measure of the resistance to flow of a liquid. Copper is a solid metal, so measuring viscosity does not apply.
ability to flow.
a substance resistance to flow