Interfacial area is a research area that deals with the study of interfaces between different phases of matter, such as liquid-liquid, gas-solid, or liquid-solid interfaces. It focuses on understanding the behavior and properties of these interfaces, including their structure, dynamics, and the interactions between the two phases. Interfacial area research is important in various fields such as chemistry, materials science, and environmental science, as it can help in designing new materials, improving processes, and understanding complex systems.