Mass transfer is the movement of a substance from one location to another within a physical system. It involves the transport of mass, energy, and momentum through fluids or gas phases. The process is crucial in a wide range of fields, including chemical engineering, environmental science, and medical research. Mass transfer is a specialized skill that requires a detailed understanding of the physical and chemical properties of substances and how they interact with their surroundings. Professionals who specialize in mass transfer are in high demand in many industries, and their expertise is essential for optimizing processes and developing new technologies.