Mass transfer refers to the movement of mass from one place to another due to a difference in concentration or other driving forces. This area of research is concerned with understanding and predicting the transport of substances, such as molecules, ions, or particles, within a medium or between different phases. Mass transfer processes are important in various fields of science and engineering, including chemical engineering, environmental engineering, and biotechnology. Researchers in mass transfer study phenomena such as diffusion, convection, and mass transfer coefficients to develop models and methods for analyzing and optimizing mass transfer processes. They may also investigate the design and operation of equipment and systems that involve mass transfer, such as distillation columns, reactors, and membrane systems. Overall, mass transfer research aims to improve our understanding of how mass is transferred in different systems and to develop strategies for enhancing mass transfer efficiencies in various applications.