Newtontyyppiset

Newtontyyppiset, which translates to "Newtonian" in English, refers to fluids that adhere to Newton's law of viscosity. This law states that the shear stress within a fluid is directly proportional to the rate of shear strain. In simpler terms, for a Newtonian fluid, the viscosity remains constant regardless of the forces applied to it. This means that the fluid's resistance to flow does not change whether it is stirred gently or vigorously.

Common examples of Newtonian fluids include water, air, ethanol, and light oils. When you pour water, its viscosity is the same no matter how fast or slow you pour it. Similarly, the air we breathe behaves as a Newtonian fluid; its resistance to movement is consistent.

In contrast, non-Newtonian fluids exhibit a viscosity that changes depending on the applied shear stress or shear rate. This means their "thickness" or "thinness" can vary. Examples of non-Newtonian fluids include ketchup, toothpaste, and cornstarch mixed with water (oobleck). Ketchup becomes runnier when you shake the bottle, and oobleck can be a liquid when handled gently but solidifies when hit quickly. The study of fluid behavior, including both Newtonian and non-Newtonian types, falls under the field of rheology. Understanding the distinction between these two fluid types is crucial in various scientific and engineering applications, from designing pipelines to formulating consumer products.