Part 5470

<h1>Hydrodynamics</h1> <Xpage=716>

<hw>Hy`dro*dy*nam"ics</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Hydro-</ets>, 1 + <ets>dynamics</ets>: cf. F. <ets>hydrodynamique</ets>.]</ety> <def>That branch of the science of mechanics which relates to fluids, or, as usually limited, which treats of the laws of motion and action of nonelastic fluids, whether as investigated mathematically, or by observation and experiment; the principles of dynamics, as applied to water and other fluids.</def>

<note>&hand; The word is sometimes used as a general term, including both hydrostatics and hydraulics, together with pneumatics and acoustics. See <er>Hydraulics</er>.</note>

<h1>Hydrodynamometer</h1> <Xpage=716>

<hw>Hy`dro*dy`na*mom"e*ter</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Hydro-</ets>, 1 + <ets>dynamometer</ets>.]</ety> <def>An instrument to measure the velocity of a liquid current by the force of its impact.</def>

<h1>Hydro-electric</h1> <Xpage=716>

<hw>Hy`dro-e*lec"tric</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[<ets>Hydro-</ets>, 1 + <ets>electric</ets>.]</ety> <def>Pertaining to, employed in, or produced by, the evolution of electricity by means of a battery in which water or steam is used.</def>

<cs><col>Hydro-electric machine</col> <fld>(Physics)</fld>, <cd>an apparatus invented by Sir William Armstrong of England for generating electricity by the escape of high-pressure steam from a series of jets connected with a strong boiler, in which the steam is produced.</cd></cs>

<h1>Hydro-extractor</h1> <Xpage=716>

<hw>Hy`dro-ex*tract"or</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Hydro-</ets>, 1 + <ets>extractor</ets>.]</ety> <def>An apparatus for drying anything, as yarn, cloth, sugar, etc., by centrifugal force; a centrifugal.</def>

<h1>Hydroferricyanic</h1> <Xpage=716>

<hw>Hy`dro*fer`ri*cy*an"ic</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Hydro-</ets>, 2 + <ets>ferricyanic</ets>.]</ety> <fld>(Chem.)</fld> <def>Pertaining to, or containing, or obtained from, hydrogen, ferric iron, and cyanogen; <as>as, <ex>hydroferricyanic</ex> acid</as>. See <er>Ferricyanic</er>.</def>

<h1>Hydroferrocyanic</h1> <Xpage=716>

<hw>Hy`dro*fer`ro*cy*an"ic</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[<ets>Hydro-</ets>, 2 + <ets>ferrocyanic</ets>.]</ety> <fld>(Chem.)</fld> <def>Pertaining to, or containing, or obtained from, hydrogen, ferrous iron, and cyanogen; <as>as, <ex>hydroferrocyanic</ex> acid</as>. See <er>Ferrocyanic</er>.</def>

<h1>Hydrofluate</h1> <Xpage=716>

<hw>Hy`dro*flu"ate</hw> <tt>(?)</tt>, <tt>n.</tt> <fld>(Chem.)</fld> <def>A supposed compound of hydrofluoris acid and a base; a fluoride.</def> <mark>[Archaic]</mark>

<h1>Hydrofluoric</h1> <Xpage=716>

<hw>Hy`dro*flu*or"ic</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[<ets>Hydro-</ets>, 2 + <ets>fluoric</ets>.]</ety> <fld>(Chem.)</fld> <def>Pertaining to, or containing, hydrogen and fluorine; fluohydric; <as>as, <ex>hydrofluoric</ex> acid</as>.</def>

<cs><col>Hydrofluoric acid</col> <fld>(Chem.)</fld>, <cd>a colorless, mobile, volatile liquid, <chform>HF</chform>, very corrosive in its action, and having a strong, pungent, suffocating odor. It is produced by the action of sulphuric acid on fluorite, and is usually collected as a solution in water. It attacks all silicates, as glass or porcelain, is the agent employed in etching glass, and is preserved only in vessels of platinum, lead, caoutchouc, or gutta-percha.</cd></cs>

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<h1>Hydrofluosilicate</h1> <Xpage=717>

<hw>Hy`dro*flu`o*sil"i*cate</hw> <tt>(?)</tt>, <tt>n.</tt> <fld>(Chem.)</fld> <def>A salt of hydrofluosilic acid; a silicofluoride. See <er>Silicofluoride</er>.</def>

<h1>Hydrofluosilicic</h1> <Xpage=717>

<hw>Hy`dro*flu`o*si*lic"ic</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[<ets>Hydro-</ets>, 2 + <ets>fluo</ets>rine + <ets>silicic</ets>.]</ety> <fld>(Chem.)</fld> <def>Pertaining to, or denoting, a compound consisting of a double fluoride of hydrogen and silicon; silicofluoric. See <er>Silicofluoric</er>.</def>

<h1>Hydrogalvanic</h1> <Xpage=717>

<hw>Hy`dro*gal*van"ic</hw> <tt>(?)</tt>, <tt>a.</tt> <ety>[<ets>Hydro-</ets>, 1 + <ets>galvanic</ets>.]</ety> <def>Pertaining to, produced by, or consisting of, electricity evolved by the action or use of fluids; <as>as, <ex>hydrogalvanic</ex> currents</as>.</def> <mark>[R.]</mark>

<h1>Hydrogen</h1> <Xpage=717>

<hw>Hy"dro*gen</hw> <tt>(?)</tt>, <tt>n.</tt> <ety>[<ets>Hydro-</ets>, 1 + <ets>-gen</ets>: cf. F. <ets>hydrog\'8ane</ets>. So called because water is generated by its combustion. See</tt> <er>Hydra</er>.]</ety> <fld>(Chem.)</fld> <def>A gaseous element, colorless, tasteless, and odorless, the lightest known substance, being fourteen and a half times lighter than air (hence its use in filling balloons), and over eleven thousand times lighter than water. It is very abundant, being an ingredient of water and of many other substances, especially those of animal or vegetable origin. It may by produced in many ways, but is chiefly obtained by the action of acids (as sulphuric) on metals, as zinc, iron, etc. It is very inflammable, and is an ingredient of coal gas and water gas. It is standard of chemical equivalents or combining weights, and also of valence, being the typical monad. Symbol H. Atomic weight 1.</def><-- At. wt. = 1.008 using carbon as 12.000 -->