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Specific gravity
From The Aquarium Wiki
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Specific Gravity (sg) is the ratio of the density of a liquid against the density of pure water.
Typically used in the measurement of salt content in brackish, marine or reef aquarium. A hydrometer, or a refractometer are typical devices used to measure sg.
[edit] Effects on s.g. by Temperature
| °C/°F | sg with salinity at 30.6ppt |
| 7°C (44.6°F) | 1.025 |
| 13°C (55.4°F) | 1.024 |
| 18°C (64.4°F) | 1.023 |
| 22°C (71.6°F) | 1.022 |
| 25°C (77°F) | 1.021 |
| 28°C (82.4°F) | 1.020 |
| 31°C (87.8°F) | 1.019 |
| 34°C (93.2°F) | 1.018 |
| 37°C (98.6°F) | 1.017 |
