0 a piece of equipment used for measuring the density (= the relationship between the weight of something and its size) of a liquid -- areometr
In a non-sealed battery each of the cells can be checked with a portable or hand-held hydrometer.
The spirit manufactured was tested with a hydrometer and measured by the "daroga" without whose knowledge no spirit could be removed from the distillery.
Using the hydrometer, brewers could calculate the yield from different malts.
In practice the stalk of the hydrometer is pre-marked with graduations to facilitate this measurement.
Although ethylene glycol hydrometers are widely available and mass-marketed for antifreeze testing, they give false readings at high temperatures because specific gravity changes with temperature.
The electrolyte can not be tested by hydrometer to diagnose improper charging, which can reduce battery life.
He studied new hydrometers (to measure the level of a river), rain gauges, and hydraulic operations over rivers.
Texture was measured with the hydrometer method23.
