A "unit operation" is one step in a process to convert a raw material into some useful chemical product. It's one of the black boxes which appeared in process flowsheets first encountered in course CHEME 2004, a black box which performs some physical (as opposed to chemical) change. And the transport phenomenon is a mathematical description of momentum, heat or mass transfer occurred in unit operations. In the first part of the sequent courses (I), (II), and (III), emphasis will be placed on the introduction of basic principles in fluid mechanics that are of fundamental importance to chemical engineers.