Newtonian Fluid

A Newtonian fluid is a type of liquid whose flow behavior remains consistent regardless of the force applied to it. In other words, its viscosity (internal resistance to flow) stays constant at a given temperature and pressure. Common examples include water, air, and alcohol. When you stir or pour a Newtonian fluid, the resistance you feel is directly proportional to how quickly you try to move it. This predictable behavior makes Newtonian fluids easier to model and understand in science and engineering, as their flow characteristics do not change with different shear stresses.