👉 A set fluid, also known as a set of fluids or simply fluids, is a collection of different fluids that are physically mixed together but remain distinct in terms of their physical properties such as density, viscosity, and chemical composition. These fluids can be liquids or gases, and they often coexist in a single system, such as in a water tank containing both water and oil, where each fluid occupies its own volume but can interact with each other through processes like diffusion or phase separation. The behavior of set fluids is governed by principles of fluid dynamics and thermodynamics, making them crucial in various scientific and engineering applications, from industrial processes to biological systems.