Hydrometer: An instrument used for measuring the specificgravity of a liquid or solution.
比重计:量度液体或溶液的比重的仪器。
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An instrument used to measure pressure. A manometer consists of a U-shaped tube partially filled with a liquid that can vary in specificgravity from 1.0 (water) to 13.57 (mercury).
The medium of is suspending liquid with high density. Under the action of centrifugal force the minerals are separated according to their specificgravity in the heavy medium cyclone.