Determination Of Specific Gravity Of Liquids. The density of pure water is also 62.4 lbs/cu.ft (pounds per cubic foot) and if we know that a sample of ethyl alcohol has a sg of 0.785 then we can calculate that its density is. Specific gravity of sample = ___density of the substance___ density of the purified water.
The invention improves upon the known systems for detecting specific gravity by the use of a polyelectrolyte polymer and ph indicator by the addition of a crown ether ionophore which enhances the ability of the reagent system to indicate the fluid's specific gravity. Two methods are commonly used for determining the specific gravities of liquids. Specific gravity is a unitless measurement.