Specific gravity of liquids and solids

Specify the common reference material(s) used to determine the specific gravity of liquids and solids. 

Usually, the specific gravity of liquids and solids refers to the maximum mass density of pure water (i.e., 999.973 kg.m measured at 3.98°C or sometimes 999.972 kg.m measured at 4°C), but other solvents could also be used as standards. For instance, common specific gravities commonly used in the industry are d ° d j ., and... 

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