0 a piece of equipment used to measure the density (= amount of matter in a particular quantity) of liquids, especially a long glass tube, closed and with a weight at one end so that it floats vertically -- 液体比重计,浮秤(用于测量溶液密度的仪器,尤指封闭的长试管,一端有砝码,可使液体竖直流动)
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.