Accuracy of determining density or relative density is determined by the combined accuracy of measuring the volume and weight of a given quantity of the substance. While measuring relative density of liquids, two common method of measuring the volume are a measuring cylinder and a density bottle.Among these two method the density bottle gives more accurate measurement of the volume, resulting in more accurate determination of density or relative density.
Volume is measured using a measuring cylinder by pouring a given quantity of the liquid in the cylinder and reading out the quantity against the graduations provided in the cylinder for the purpose. In this method errors can occur due to the limitation of the human eye to differentiate between minor variations in the level of the liquid in the cylinder. Also generally the graduations in the measuring cylinder are not marked too accurately. In contrast the density bottles are manufactured to contain a known exact volume of liquid with much higher accuracy of measurement. Also the bottle with the stopper are so designed that human limitation do not affect the quantity of liquid filled in it.
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