The study of properties of fluids is a base for basic understanding of flow or static condition of fluids. Some important properties of fluids are density, viscosity, surface tension, bulk modulus, vapour pressure, etc. Viscosity causes resistance to flow between two adjacent layers of fluid. Surface tension leads to capillary effects. Bulk modulus is involved in the propagation of disturbances like sound waves in fluids. Vapour pressure can cause flow disturbances due to evaporation at locations of low pressure. It plays an important role in cavitation studies in hydraulic machines.
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