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Procedure to define the Specific Gravity

Briefly explain the procedure to define the Specific Gravity?

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The Specific Gravity, SG, is the unit less quantity which provides the scientist or engineers an idea of how dense a substance is as compared to water. The density of water that is one kilogram per liter (at 4 oC), is assigned a SG of about 1.000. When a substance is denser than water, it will contain a SG greater than 1.000; whenever it is less dense than water, its SG will be a value less than 1.000 (however greater than zero). Let's state a substance consists of a density of 2.5 kilograms per liter. That signifies that its SG is 2.5 (that is, 2.5 divided by 1.000).   

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