Real or practical fluids are characterized by___________________?
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Answer: D. possess all the above properties
Explanation
Real fluids possess viscosity, surface tension, and compressibility, unlike idealized theoretical fluids. Every practical fluid exhibits internal frictional resistance to shear flow, quantified as dynamic or kinematic viscosity. Real liquids and gases also experience surface tension at phase interfaces and undergo density changes under varying pressure. Fluid mechanics categorizes fluids into ideal theoretical models and real practical fluids encountered in engineering applications. Viscosity generates frictional head losses in pipe networks, while compressibility affects high-speed gas dynamics and acoustics. Surface tension explains capillary action, droplet formation, and meniscus curvature in fluid measurement instruments.
Option A is incomplete because real fluids also possess surface tension and compressibility in addition to viscosity. Option B is wrong because considering surface tension alone ignores vital viscous and compressible fluid behaviors. Option C is incorrect because compressibility alone does not encompass all physical properties exhibited by real practical fluids.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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