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Discover Ludwig"specific gravity" is correct and can be used in written English.
You can use it in a sentence where you are describing the mass of an object compared to the mass of an equal volume of a reference substance, such as water. For example: "The specific gravity of iron is 7.87, which is considerably greater than that of water."
Dictionary
specific gravity
noun
The ratio of the mass of a substance to that of an equal volume of water at 4C (or to some other reference substance)
synonyms
Exact(60)
Specific gravity.
See also specific gravity.
Lastly, a hydrometer, to check specific gravity.
It has a specific gravity of 2.71.
Check the specific gravity again – it should be about 1.042.
Another property closely related to density is specific gravity.
Since it is a ratio, specific gravity has no units.
Specific gravity is dimensionless (i.e., has no units).
Specific gravity monitoring device means a unit of equipment used to monitor specific gravity and having a minimum accuracy of ±0.02 specific gravity units.
w eiguij reduced to specific gravity 1,000.
= specific gravity.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com