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hydrometer

[hahy-drom-i-ter] /haɪˈdrɒm ɪ tər/
noun
1.
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.
Origin
1665-1675
1665-75; hydro-1 + meter
Related forms
hydrometric
[hahy-druh-me-trik] /ˌhaɪ drəˈmɛ trɪk/ (Show IPA),
hydrometrical, adjective
hydrometry, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for hydrometry

hydrometer

/haɪˈdrɒmɪtə/
noun
1.
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
Derived Forms
hydrometric (ˌhaɪdrəʊˈmɛtrɪk), hydrometrical, adjective
hydrometrically, adverb
hydrometry, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for hydrometry

hydrometer

n.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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hydrometry in Medicine

hydrometer hy·drom·e·ter (hī-drŏm'ĭ-tər)
n.
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.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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hydrometry in Science
hydrometer
  (hī-drŏm'ĭ-tər)   
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for hydrometry

hydrometer

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

Learn more about hydrometer with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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