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The relation between descriptive variables of flowing air, pressure and the like, and the dynamic field, speeds or velocities, are often invoked for their understanding. Such relationships depend on whether the flow is compressible or not. When it is, physical work done by air elements on one another, become important. This chapter, virtually devoid of illuminating images, nevertheless sheds light on how to think about air flows in general and how to deduce the local pressures from knowledge of the flow field.

Pressure: The Bernoulli Principle and Flow Energy Conservation