resistance or linear drag is appropriate for objects or particles moving through a fluid at relatively slow speeds (assuming there is no turbulence). Purely laminar flow only exists up to Re = 0.1 under this definition. In this case, the force of drag is approximately proportional to velocity. The equation for viscous resistance is:

where:
* is a constant that depends on both the material properties of the object and fluid, as well as the geometry of the object; and
* is the velocity of the object.

When

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