👉 A contacting fluid, also known as an interface fluid or boundary fluid, is a substance used to facilitate the interaction between two immiscible phases, such as oil and water. It forms a thin film at the interface between these phases, reducing surface tension and enabling processes like wetting, spreading, and emulsification. Common examples include mineral oils, silicones, and surfactants, which are crucial in applications ranging from lubrication and coatings to firefighting and pharmaceuticals. The choice of contacting fluid depends on the specific requirements of the process, such as compatibility with materials, environmental considerations, and desired performance characteristics.
