What is basic difference between viscosity and plastic viscosity?

My answer to What is basic difference between viscosity and plastic viscosity?

Answer by Arûn Râinâ:

The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress.

For liquids, it corresponds to the informal concept of "thickness". For example, honey has a much higher viscosity than water.

Viscosity is a property arising from collisions between neighboring particles in a fluid that are moving at different velocities. When the fluid is forced through a tube, the particles which compose the fluid generally move more quickly near the tube's axis and more slowly near its walls: therefore some stress, (such as a pressure difference between the two ends of the tube), is needed to overcome the friction between particle layers to keep the fluid moving. For the same velocity pattern, the stress required is proportional to the fluid's viscosity.

The word "viscosity" is derived from the Latin "viscum", meaning mistletoe and also a viscous glue made from mistletoe berries

Apparent viscosity (sometimes denoted η)is the shear stress applied to a fluid divided by the shear rate (

For a Newtonian fluid, the apparent viscosity is constant, and equal to the Newtonian viscosity of the fluid, but for non-Newtonian fluids, the apparent viscosity depends on the shear rate. Apparent viscosity has the SI derived unit Pa·s (Pascalsecond, but the centipoise is frequently used in practice: (1 mPa·s = 1 cP).

What is basic difference between viscosity and plastic viscosity?

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