ABSTRACT
The transport of fluids through pipes is very important in many industrial processes and is considered as a unit operation within engineering. In the study of transport, the type of fluid should be known and should be classified:
• According to the behavior presented under the action of external pressures. The fluids may be compressible or incompressible. If the volume of the fluid is independent of its pressure and temperature, then the fluid is incompressible; on the other hand, if the volume varies, the fluid is compressible. Actually, no fluid is incompressible, although liquids may be considered as such. However, gases present a large variation of compressibility with pressure and temperature.
