Figure 9b compares the complex viscosity (from dynamic parallel-plate experiments) with the absolute viscosity
determined using the sliding plate and capillary rheometers for representative polymers of Series 2 (various molecular weights).
The absolute viscosity
for Schiff bases and Resins improved with the escalation in concentration and decline with increase in temperature.
Similarly empirical relations were established between temperature and absolute viscosity
for lubricants derived from seed oils .
The UHMWPO has a weight-average molecular weight of 3,500,000 to 10,500,000 g/mol and an absolute viscosity
of 5 to 45 dL/g.
For liquids, it corresponds to the informal concept of thickness ,also viscosity known as kinematic viscosity, absolute viscosity
or simple viscosity and defined mathematically as the ratio of the shearing stress to the velocity gradient in a fluid , due to Newton's equation for fluids, which similar to Newton's second law of motion  as follows:
[C.sub.1] presents the absolute viscosity
while [C.sub.2], [C.sub.3], and [C.sub.4] are fitting parameters.