👉 The ill fluid, also known as illiquid fluid or non-Newtonian fluid, is a type of fluid that does not behave like traditional liquids or gases under normal conditions. Unlike Newtonian fluids, which have a constant viscosity regardless of applied force, ill fluids exhibit variable viscosity depending on the shear rate or stress applied to them. This means that their flow properties change dramatically; for instance, they can become more fluid-like under high stress and thicker under low stress. This unique characteristic is observed in substances like blood, ketchup, and certain types of polymer solutions. The behavior of ill fluids is explained by complex interactions between their molecular structure and the applied forces, making them fascinating subjects in both physics and engineering.
