| Viscosity is a measure of the resistance of a fluid to deform under shear stress. It is commonly perceived as "thickness",
or resistance to pouring. Viscosity describes a fluid's internal resistance to flow and may be thought of as a measure of
fluid friction. Thus, water is "thin", having a lower viscosity, while vegetable oil is "thick" having a higher viscosity.
All real fluids (except superfluids) have some resistance to shear stress, but an idealized fluid which has no resistance
to shear stress is known as an ideal fluid.
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