Viscosity measures a fluid’s resistance to flow. This experiment typically involves dropping a sphere in a viscous liquid and using Stokes’ law to determine viscosity:

Where:

• η is the viscosity of the fluid,

• r is the radius of the sphere,

• ρ_s and ρ_f are the densities of the sphere and fluid,

• g is acceleration due to gravity,

• v is the terminal velocity of the sphere.

Significance
Understanding viscosity is crucial in industries such as lubrication, pharmaceuticals, and food processing.