👉 Empirical fluid, also known as empirical viscosity or dynamic viscosity, is a measure of a fluid's resistance to flow or its internal friction. It quantifies how much a fluid opposes the relative motion of its layers when subjected to shear stress. Unlike theoretical or molecular viscosity, which is derived from fundamental physical constants and the molecular structure of a fluid, empirical fluid is determined experimentally through various methods such as rotational viscometry or capillary flow experiments. This empirical measure is crucial in understanding and predicting fluid behavior in practical applications, from industrial processes to biological systems.
