**How to calculate and measure specific gravity. If the density of a substance is known, to calculate the specific gravity of a substance simply divide the density of the substance by the density of water or air. Because the density of water is 1000 kg/m3 or 1 g/cm3, it is simple to calculate.**

## How to Use Specific Gravity?

Specific gravity is a measure of the relative density of a substance compared to water. It is used to determine the amount of a substance in a given volume. Knowing how to use specific gravity can be helpful when measuring liquids or solids.

When measuring liquids, the specific gravity is determined by measuring the liquidâ€™s density and then dividing it by the density of water. This can be done by using a hydrometer, a device which measures the density of liquids. A hydrometer is filled with the liquid to be measured and its density is then read from a scale. The density is divided by the density of water and the result is the liquidâ€™s specific gravity.

When measuring solids, the specific gravity is determined by measuring the solidâ€™s mass and then dividing it by the mass of an equal volume of water. This can be done by using a pycnometer, a device which measures the mass of a sample. The sample is placed into the pycnometer and its mass is then read from a scale. The mass is divided by the mass of an equal volume of water and the result is the sampleâ€™s specific gravity.

Specific gravity can also be used to measure the concentration of a solution.

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