Question

in which case do we use this formula??

Answer 1

so hi
this is specific gravity
Specific gravity is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume.
uses
It is used to define the weight or density of a liquid as compared to the density of an equal volume of water at a specified temperature.
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