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Hydrometer   Listen
Hydrometer  n.  
(Physics) An instrument for determining the specific gravities of liquids, and thence the strength spirituous liquors, saline solutions, etc. Note: It is usually made of glass with a graduated stem, and indicates the specific gravity of a liquid by the depth to which it sinks in it, the zero of the scale marking the depth to which it sinks in pure water. Extra weights are sometimes used to adapt the scale to liquids of different densities.
An instrument, variously constructed, used for measuring the velocity or discharge of water, as in rivers, from reservoirs, etc., and called by various specific names according to its construction or use, as tachometer, rheometer, hydrometer, pendulum, etc.; a current gauge.

Collaborative International Dictionary of English 0.48

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"Hydrometer" Quotes from Famous Books

... quite different from any previously discussed is the capillary hydrometer or staktometer of Brewster, which is based upon the difference in the surface tension and density of pure water, and of mixtures of alcohol and ...
— Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 2 - "Demijohn" to "Destructor" • Various

... divided instruments being into degrees and sixths. On the floor of this observatory a meridian line was drawn. The want of correct means of measuring time and temperature was severely felt; the clepsydra of Ctesibius answered very imperfectly for the former, the hydrometer floating in a cup of water for the latter; it measured variations of temperature by variations of density. Philadelphus, who toward the close of his life was haunted with an intolerable dread of death, devoted much of his time to the ...
— History of the Conflict Between Religion and Science • John William Draper

... was glad to get your letter, as I thought you must be due about this time, and I had not heard of your arrival. I can imagine no change for the worse equal to that of coming from the blue sky and thermometer of Andalusia to the fogs and hydrometer of London, and your impaired respiratory organs must ...
— Memoirs of the Life and Correspondence of Henry Reeve, C.B., D.C.L. - In Two Volumes. VOL. II. • John Knox Laughton

... scientific purposes; as early as 1784 he made an ascent to a height of 9,000 feet, and observed a fall in temperature of from degrees—at the level of London, where he began his ascent—to 29 degrees at the maximum height reached. He took up an electrometer, a hydrometer, a compass, a thermometer, and a Toricelli barometer, together with bottles of water, in order to collect samples of the air at different heights. In 1785 he made a second ascent, when trigonometrical observations of the height of the balloon were made ...
— A History of Aeronautics • E. Charles Vivian

Words linked to "Hydrometer" :   thermohydrometer, measuring instrument, measuring device, salinometer

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