ABSTRACT
Mass transfer can result from several different phenomena. There is a mass transfer associated with convection in that mass is transported from one place to another in the flow system. This type of mass transfer occurs on a macroscopic level and is usually treated in the science of fluid dynamics. When a mixture of gases or liquids is contained in a container such that there exists a concentration gradient of one or more of the constituents across the system, there will be a mass transfer on a microscopic level as a result of diffusion from the regions of high concentration to the regions of low concentration. In our discussions in this book, we are primarily concerned with some of the simple relations which may be used to calculate mass diffusion.
