👉 A tight fluid, also known as viscous fluid, is a type of fluid characterized by its high viscosity, meaning it resists flow and deformation. This property results from the strong intermolecular forces between its constituent molecules, which require more energy to move past one another. Consequently, a tight fluid exhibits a thicker consistency and flows more slowly compared to less viscous fluids like water or oil. Examples include honey, syrup, and certain oils. In biological systems, tissues such as blood can behave like a tight fluid under specific conditions, especially when oxygenated and less viscous than deoxygenated blood. The term "tight" in this context emphasizes the fluid's resistance to flow and its higher resistance to shear stress.
