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What is a fluid ?

 Fluid is a defined as a substance which continuously deforms under the action of shearing forces. Liquids and gases are termed as fluids. A fluid is said to be incompressible if its density does not change with a change in pressure. Liquids are incompressible. A fluid said to be compressible if its density changes with a change in pressure or temperature or velocity. Gases are compressible. The effect of compressibility must be considered in flow problem of gases. 









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