Blending of Viscosity across Different MediaViscosity refers to a fluid's resistance to flow, defined as the magnitude of shear stress required on each square centimeter of a surface when the liquid flows at a velocity of 1 cm/s, known as kinematic viscosity, measured in Pa·s. Viscosity is an attribute of fluids. When fluids flow through pipelines, they exhibit three states: laminar, transitional, and turbulent. The same three flow states exist in mixing equipment, with fluid viscosity being one of the key parameters determining these states. Generally, during mixing, fluids with a viscosity less than 5 Pa·s are considered low viscosity, such as water, castor oil, molasses, jam, honey, heavy oils, and low-viscosity emulsions; 5-50 Pa·s are medium viscosity fluids, like inks and toothpaste; 50-500 Pa·s are high viscosity fluids, such as chewing gum, plasticizers, and solid fuels; and greater than 500 Pa·s are ultra-high viscosity fluids, such as rubber compounds, plastic melts, and organosilicones. For low-viscosity media, small-diameter, high-speed agitators can drive the fluid circulation around them and to distant areas. However, for high-viscosity media, the agitator itself must push the fluid. Impellers suitable for low and medium viscosity fluids include paddle, open turbine, propeller, long and thin spiral, disk turbine, Bruma King, plate and frame, three-blade backward弯曲, and MIG types. Impellers suitable for high and ultra-high viscosity fluids include ribbon, screw, anchor, frame, and propeller types. Some fluids may change in viscosity as the reaction progresses, requiring impellers that can accommodate a wide range of viscosities, such as universal impellers.