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）
Mechanical analysis was used to determine percent sand, silt and clay using a soil hydrometer method17,18.
The density of the brine in the reservoir was measured using a hydrometer accurate to 0.0005 g ml-1.
The simplest method of measuring the specific gravity of a liquid is the hydrometer.
The sand fraction (63-2000 m) was determined by wet sieving, with silt (2-63 m) and clay (<2 m) determined by hydrometer.
But to compensate for long-term aquarium evaporation, it is far more convenient to use a hydrometer to characterize the specific gravity while adding pure water as needed.
When the solution is cool, the gravity is read by hydrometer, and small quantities of water or concentrated potash solution are added till the required gravity is obtained.
Hydrometer method used for making particle size analyses of soils.
Texture was measured with the hydrometer method23.
