Viscosity is defined as the measure of the resistance of a fluid to gradual deformation by shear or tensile stress. Viscosity denotes opposition to flow. The reciprocal of the viscosity is called the fluidity, a measure of the ease of flow. Viscosity can also be described in terms of a fluids thickness.
Viscosity is measured in terms of a ratio of shearing stress to the velocity gradient in a fluid. If a sphere is dropped into a fluid, the viscosity can be determined using the following formula:
∆ρ is the density difference between fluid and sphere tested
a is the radius of the sphere
g is the acceleration due to gravity
v is the velocity of the sphere
where, v = distance travelled by sphere/ time it takes to travel that distance
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