Fluid Mechanics
The terminal velocity of a small sphere settling in a viscous fluid varies as the

Square of the difference in specific weights of solid & fluid
First power of its dimeter
Inverse of the fluid viscosity
Inverse square of the diameter

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Fluid Mechanics
Turbine impeller

Is effective over wide range of viscosities
Produces only tangential current
Produces only radial current
Does not produce tangential current

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