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[hahy-drom-i-ter] /haɪˈdrɒm ɪ tər/

an instrument for determining the specific gravity of a liquid, commonly consisting of a graduated tube weighted to float upright in the liquid whose specific gravity is being measured.
an instrument for measuring the relative density of a liquid, usually consisting of a sealed graduated tube with a weighted bulb on one end, the relative density being indicated by the length of the unsubmerged stem

1670s, from hydro- + meter (n.3).

hydrometer hy·drom·e·ter (hī-drŏm’ĭ-tər)
An instrument used to determine specific gravity, especially a sealed graduated tube, weighted at one end, that sinks in a fluid to a depth indicating the fluid’s specific gravity. Also called gravimeter.
hy’dro·met’ric (hī’drə-mět’rĭk) adj.
hy·drom’e·try n.
An instrument used to measure the density of a liquid as compared to that of water. Hydrometers consist of a calibrated glass tube ending in a weighted glass sphere that makes the tube stand upright when placed in a liquid. The lower the density of the liquid, the deeper the tube sinks.


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