Hi Everyone, Not my strongest topic but I do know the answer to this one. A Newtonian fluid's viscosity remains constant, no matter the amount of shear applied for a constant temperature. These fluids have a linear relationship between viscosity and shear stress. Non-Newtonian fluids are the opposite of Newtonian fluids. When shear is applied to non-Newtonian fluids, the viscosity of the fluid changes. This can be either Dilatant - viscosity is directly proportional, Psuedoplastic - viscosity is Inversely proportional, Rheopectic - viscosity is directly proportional over time or thixotropic - viscosity is inversely proportional over time. Why do you need to know the difference? It's important to fully understand the properties of the fluids you're transferring, mixing, or pumping, because viscosity plays a major role in sizing and selecting equipment. Understanding how it reacts to shear will help you properly size and select all the equipment it comes in contact with. I am a very busy person, so apologies in advance if it takes a few days to get back to anyone. Great topic OP. Very important knowledge to have.