Specific gravity is the density or ratio of any substance to another substance. It sometimes may be called just gravity or relative density. When calculating the specific gravity of a liquid or solid, water is normally the comparison (water has a specific gravity of 1).
Even though two objects are the same size, their density may be different. This is expressed in how much more weight the object is in comparison to the same amount of water. Likewise a gas is compared to air.
Specific Gravity of Gas
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Specific gravity of a gas is calculated as follows:
When density is known:
where
| gas gravity | dimensionless | |
| |
density of the gas | |
| density of air | |
When molecular weight is known:
where
| gas gravity | dimensionless | |
| |
Molecular Weight of the gas | |
| Molecular Weight of air | 28.9625 |
Conversion
| Multiply Specific Gravity | By | To get |
|---|---|---|
| 436995.7259 | Grain Per Cubic Foot | |
| 252.8910451 | Grain Per Cubic Inch | |
| 1 | Gram Per Cubic Centimeter | |
| 1E+15 | Gram Per Cubic Kilometer | |
| 1000000 | Gram Per Cubic Meter | |
| 0.001 | Gram Per Cubic Millimeter | |
| 1000000 | Gram Per Kiloliter | |
| 1000 | Gram Per Liter | |
| 1 | Gram Per Milliliter | |
| 0.001 | Kilogram Per Cubic Centimeter | |
| 1E+12 | Kilogram Per Cubic Kilometer | |
| 1000 | Kilogram Per Cubic Meter | |
| 1E-15 | Kilogram Per Cubic Micrometer | |
| 0.000001 | Kilogram Per Cubic Millimeter | |
| 998.8473734 | Ounce Per Cubic Foot | |
| 0.578036674 | Ounce Per Cubic Inch | |
| 62.42796084 | Pound Per Cubic Foot | |
| 0.036127292 | Pound Per Cubic Inch | |
| 1 | Water ( Std. Conditions) | |
| 1 | Specific Gravity, Water |
