Hydrometers

Hydrometers determine the density of liquids or the concentration of dissolved matter.Density is frequently indicated in g/cm3 (g/ml) or in °Baumé. Concentration is indicated in percentage by volume (Vol.%) or in percentage by mass (Weight%). Permissible deviations are within ± 2 graduation marks. our the sample into a transparent cylinder (see fig. 1) and adjust its temperature to the indicated reference temperature of the hydrometer. Immediately before measuring, mix well with a glass rod to reduce differing sample densities and temperatures.