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Specific gravity is a measure of density in comparison to the density of water (or air). A hydrometer is used for liquids but is not the only means. If you have a scale which can measure down to milligrams accurately, then by weighing one ml of the liquid you are checking will give you the specific gravity.

specific gravity of water = 1

example: 1 milliliter of beer weighs in at 987 milligrams then the specific gravity is .987 .

.987 g/ml / 1 g/ml = .987 (SpG)

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Related Questions

How can you determine density of a liquid without measuring mass and volumne?

One way to determine the density of a liquid without directly measuring the mass and volume is by using a hydrometer. A hydrometer measures the specific gravity of a liquid, which is the ratio of the density of the liquid to the density of water. By comparing the specific gravity of the liquid to a table of known densities, you can estimate the density of the liquid.


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