This course is about measurement of the flow rate of a fluid flowing under pressure in a closed conduit. The closed conduit is often circular, but also may be square or rectangular (such as a heating duct) or any other shape. The other major category of flow is open channel flow, which is the flow of a liquid with a free surface open to atmospheric pressure. Measurement of the flow rate of a fluid flowing under pressure, is carried out for a variety of purposes, such as billing for water supply to homes or businesses or, for monitoring or process control of a wide variety of industrial processes, which involve flowing fluids. Several categories of pipe flow measurement devices will be described and discussed, including some associated calculations. Topics: An introduction to flow meters Differential flow meters Velocity flow meters Variable area flow meters Positive displacement flow meters Ideal gas law principles Intended Audience: civil, hydraulic, construction, energy, chemical, and industrial engineers. Publication Source: Harlan H. Bengtson, PhD, PE