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define sp. Gravity
in Hydraulic Structures by  

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Specific gravity is the ratio of specific weight of a fluid to the specific weight of a standard fluid. For liquids, the standard fluid chosen for compassion is pure water at 4 degree celsius. For gases the standard fluid chosen is either hydrogen or air at some specifed temperature and pressure. The specific gravity of water at the standard temperature is equal to 1 while that of mercury is 13.6.
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