Round 3: Tossup 9

An “apparent” form of this quantity equals the velocity gradient to the power of the behavior index minus one in the Ostwald-de Waele power law. One form of this quantity is divided by another to calculate Trouton’s ratio. Forces named for this quantity (-5[1])dominate in the boundary layer. When this quantity is zero, the Navier-Stokes (15[1])equations simplify to the Euler equations. In (*) thixotropic materials, this quantity (10[1])decreases when a stress is applied. This quantity does not change under shear stress for a Newtonian fluid. This quantity (10[1])comes in “dynamic” and “kinematic” forms and is zero for superfluids. For 10 points, name this measure of a fluid’s resistance to flow. ■END■ (10[1])

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