👉 A coated fluid, also known as a surface-active fluid or surfactant solution, is a specialized liquid that contains molecules with both hydrophilic (water-attracting) and hydrophobic (water-repelling) ends. These molecules form a thin, protective layer on the surface of other substances, reducing surface tension and enhancing the fluid's ability to mix with both water and non-polar liquids. This property makes coated fluids invaluable in various applications, such as emulsification, detergency, and drug delivery, where they help stabilize mixtures, clean surfaces, and improve the dispersion of active ingredients. By coating particles or droplets, these fluids prevent them from coalescing and ensure uniform distribution, thus optimizing performance in industrial processes, cosmetic formulations, and biological systems.