hydrometer


hydrometer
hydrometric /huy'dreuh me"trik/, hydrometrical, adj.hydrometry, n.
/huy drom"i teuhr/, n.
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.
[1665-75; HYDRO-1 + METER]

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▪ measurement instrument
      device for measuring some characteristics of a liquid, such as its density (weight per unit volume) or specific gravity (weight per unit volume compared with water). The device consists essentially of a weighted, sealed, long-necked glass bulb that is immersed in the liquid being measured; the depth of flotation gives an indication of liquid density, and the neck can be calibrated to read density, specific gravity, or some other related characteristic.

      In practice, the floating glass bulb is usually inserted into a cylindrical glass tube equipped with a rubber ball at the top end for sucking liquid into the tube. Immersion depth of the bulb is calibrated to read the desired characteristic. A typical instrument is the storage-battery hydrometer, by means of which the specific gravity of the battery liquid can be measured and the condition of the battery determined. Another instrument is the radiator hydrometer, in which the float is calibrated in terms of the freezing point of the radiator solution. Others may be calibrated in terms of “proof ” of an alcohol solution or in terms of the percentage of sugar in a sugar solution.

      The Baumé hydrometer, named for the French chemist Antoine Baumé, is calibrated to measure specific gravity on evenly spaced scales; one scale is for liquids heavier than water, and the other is for liquids lighter than water.

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Universalium. 2010.

Look at other dictionaries:

  • Hydrometer — Hy*drom e*ter, n. [Hydro , 1 + meter: cf. F. hydrom[ e]tre.] 1. (Physics) An instrument for determining the specific gravities of liquids, and thence the strength spirituous liquors, saline solutions, etc. [1913 Webster] Note: It is usually made… …   The Collaborative International Dictionary of English

  • hydrometer — Hy*drom e*ter, n. [Hydro , 1 + meter: cf. F. hydrom[ e]tre.] 1. (Physics) An instrument for determining the specific gravities of liquids, and thence the strength spirituous liquors, saline solutions, etc. [1913 Webster] Note: It is usually made… …   The Collaborative International Dictionary of English

  • Hydromēter — (gr.), 1) Werkzeug, das Volumen od. das Gewicht eines flüssigen Körpers, od. die Geschwindigkeit seiner Bewegung zu messen, so die Aräometer, Wind u. Strommesser; zu letzteren gehören die Hydrometrische Flasche, der Hydrometrische Flügel u. der… …   Pierer's Universal-Lexikon

  • Hydrométer — (griech., »Wassermesser«), Instrument zur Messung der Geschwindigkeit des fließenden Wassers, wie die Pitotsche Röhre, der Stromquadrant, der hydrometrische Flügel, das Hydrotachometer etc. (s. Geschwindigkeitsmessung). H. auch soviel wie… …   Meyers Großes Konversations-Lexikon

  • Hydrometer — Hydrometer, griech. deutsch, Instrument zur Bestimmung des Steigens u. Fallens des Wassers; Aräometer, s. d …   Herders Conversations-Lexikon

  • hydrometer — 1670s, from HYDRO (Cf. hydro ) + METER (Cf. meter) (n.3) …   Etymology dictionary

  • hydrometer — ► NOUN ▪ an instrument for measuring the density of liquids. DERIVATIVES hydrometric adjective hydrometry noun …   English terms dictionary

  • hydrometer — [hī dräm′ət ər] n. [ HYDRO + METER] an instrument for measuring the specific gravity of liquids: it is a graduated, weighted tube that sinks in a liquid up to the point determined by the density of the liquid hydrometric [hī΄drō me′trik,… …   English World dictionary

  • Hydrometer — Not to be confused with Hygrometer. Hydrometer from Practical Physics Schematic drawing of a hydrometer. The lower the densi …   Wikipedia

  • hydrometer — UK [haɪˈdrɒmɪtə(r)] / US [haɪˈdrɑmɪtər] noun [countable] Word forms hydrometer : singular hydrometer plural hydrometers physics a piece of equipment used for measuring the density of liquids …   English dictionary


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