To determine whether a flow is laminar or turbulent, one can calculate the dimensionless Reynolds number, Re. The definition is given by: Re p-v-L 771 Where: p is the density of the fluid. v is the relative flow velocity (in this case, between the metal sphere and the glycerol). n is the dynamic viscosity of the fluid. The characteristic length I in the formula depends on the geometry of the flow situation being examined. For instance, it could be the pipe diameter for flow inside a pipe or the diameter of the sphere in a Hppler viscometer. The larger the Reynolds number for a given situation, the more likely the fluid is to flow turbulently. As a rule of thumb, flow is typically laminar for Re < 2000 and turbulent for Re> 3000. Determine the Reynolds number for situation 4d) mentioned above and verify that the situation is definitively laminar.