The oil sample has behavior like a straight linear is Newtonian. From the
Herschel Bulkley model where n = flow behavior index (dimensionless) is 1.
Then the yield stress is 0. These are the fluid characteristics of vegetable oil. It
is that at a given temperature the viscosity of a Newtonian fluid will remain
constant regardless of which Viscometer model, spindle or speed we use to
measure it. Brookfield Viscosity Standards are Newtonian within the range of
shear rates generated by Brookfield equipment; that's why they are usable
with all Viscometer models. Newtonians are obviously the easiest fluids to
measure.