Relative density is equal to
A.\[\dfrac{Density\,of\,subs\tan ce}{Density\,of\,water\,at\,4{}^\circ C}\]
B.\[\dfrac{Density\,of\,subs\tan ce(gc{{m}^{-3}})}{1gc{{m}^{-3}}}\]
C.\[\dfrac{Mass\,of\,certain\,volume\,of\,subs\tan ce}{Mass\,of\,same\,volume\,of\,water\,at\,4{}^\circ C}\]
D.All of the above

Hint: Relative density is the proportion of the density (mass of a unit volume) of a substance to the density of given reference material. Explicit gravity typically implies relative density concerning water.

Complete answer:
The expression "relative density" is frequently favored in logical use. It is characterized as a proportion of density of a specific substance with that of water.
By chance that a substance's relative density is short of what one, at that point it is less thick than the reference; in the event that more noteworthy than 1, at that point it is denser than the reference.
In the event that the relative density is actually 1, at that point the densities are equivalent; that is, equivalent volumes of the two substances have a similar mass. On the off chance that the reference material is water, at that point, a substance with a relative density (or explicit gravity) under one will coast in water. For instance, a solid ice shape, with an overall density of about 0.91, will glide.
A substance with a relative density more noteworthy than one will sink.
Temperature and weight must be determined for both the example and the reference. Weight is almost consistently 1 atm (101.325 kPa).
Where it isn't, it is more normal to indicate the density straightforwardly. Temperatures for both example and reference differ from industry to industry. In British preparing practice, the particular gravity, as indicated above, is increased by 1000.

The correct answer is C.

Note:
Specific gravity is normally utilized in the industry as a straightforward method for getting data about the convergence of arrangements of different materials, for example, salt waters, sugar arrangements (syrups, juices, nectars, brewery and so on.)