Transport Phenomenon

Various mechanisms by which particles or quantities move from one place to another. Three common examples of transport phenomena are diffusion,convection, and radiation. There are three main types of transport phenomena: heat transfer, mass transfer, and fluid dynamics (or momentum transfer). An important principle in the study of transport phenomena is analogy between phenomena. For example, mass, energy, and momentum can all be transported by diffusion. The spreading and dissipation of an odor in air is an example of mass diffusion. Heat conduction in a solid material is an example of heat diffusion. The drag experienced by a rain drop as it falls in the atmosphere is an example of momentum diffusion (the rain drop loses momentum to the surrounding air through viscous stresses and
decelerates).