The most common compressible fluids are gases. In fact, all fluids are to some extent compressible but, although liquids vary widely in their compressibility, for many if not quite all purposes they can be treated as incompressible. One situation in which the assumption that liquids are totally incompressible will lead to an erroneous theory is that in which their motions are changed rapidly and in Chapter 8 this circumstance is described.
Unable to display preview. Download preview PDF.