👉 The term "called fluid" refers to a type of non-Newtonian fluid whose viscosity changes in response to applied shear stress or force. Unlike traditional Newtonian fluids, which maintain a constant viscosity regardless of the applied force, called fluids exhibit unique properties where their flow behavior varies. For example, they can become less viscous when subjected to higher shear rates, allowing them to flow more easily, or more viscous under similar conditions. This behavior is often seen in materials like ketchup, blood, and certain industrial fluids, where the fluid's ability to flow or resist flow can be manipulated by altering the applied stress. This adaptability makes called fluids particularly interesting in various scientific and engineering applications, from industrial processes to biological systems.