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- W981918265 abstract "This chapter provides an overview of fluids and their characteristics. Fluids are divided into liquids and gases. Gas is easy to compress and it fully expands to fill its container. There is thus no free surface. Consequently, an important characteristic of a fluid from the viewpoint of fluid mechanics is its compressibility. Another characteristic is its viscosity. Whereas a solid shows its elasticity in tension, compression, or shearing stress, a fluid does so only for compression. In other words, a fluid increases its pressure against compression, trying to retain its original volume. This characteristic is called compressibility. Furthermore, a fluid shows resistance whenever two layers slide over each other. This characteristic is called viscosity. For liquids, compressibility must be taken into account whenever they are highly pressurized, and for gases, compressibility may be disregarded whenever the change in pressure is small. Although a fluid is an aggregate of molecules in constant motion, the mean free path of these molecules is 0.06 μm even for air of normal temperature and pressure; therefore, a fluid is treated as a continuous isotropic substance. A non-existent, assumed fluid without either viscosity or compressibility is called an ideal fluid or perfect fluid. A fluid with compressibility but without viscosity is occasionally discriminated and called a perfect fluid, too." @default.
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- W981918265 date "1998-01-01" @default.
- W981918265 modified "2023-09-25" @default.
- W981918265 title "Characteristics of a fluid" @default.
- W981918265 doi "https://doi.org/10.1016/b978-034067649-3/50004-x" @default.
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