the specific gravity of an object is the ratio between the density of an object to a reference liquid. usually our reference liquid is water which has a density of 1 g/ml or 1 g/cm^3.
specific gravity (relative density) - sg - is a dimensionless unit defined as the ratio of the density of a substance to the density of water - at a specified temperature and can be expressed as.
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sg = specific gravity (e.g. pure water = 1) density of substance (ρ) this is the measure of the amount of mass per unit volume of a substance. the density is derived by dividing the mass of a tity of substance by its volume. specific gravity of substance (sg) this is the ratio of the density of a substance compared to the density of pure
relative density or specific gravity is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. specific gravity usually means relative density with respect to water. the term "relative density" is often preferred in scientific usage.
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both density and specific gravity describe mass and may be used to compare different substances. they are not however identical measures. specific gravity is an expression of density in relation to the density of a standard or reference (usually water).