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what is the difference between specific weight and specific gravity?

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what is the difference between specific weight and specific gravity?
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Density is defined as mass per unit volume; it has the SI unit kg·m-3 and is an absolute quantity. Specific gravity  is the ratio of a material's density with that of water at 4 °C (where it is most dense and is taken to have the value (*) 999.974  kg·m-3) and is therefore a relative quantity with no units.
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