hydrosphygmograph |
A sphygmograph in which the pulse beat is transmitted to the recorder through a column of water. (05 Mar 2000) |
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hydrostat |
A device for regulating water level. Origin: hydro-+ G. Statikos, causing to stand (05 Mar 2000) |
hydrostatic |
Relating to the pressure of fluids or to their properties when in equilibrium. (05 Mar 2000) |
hydrostatic dilator |
An instrument for dilating oesophageal strictures; fluid pressure is delivered into a flexible area of the instrument placed in the stricture to establish a uniform dilating pressure. (05 Mar 2000) |
hydrostatic pressure |
The pressure exerted by a liquid as a result of its potential energy, ignoring its kinetic energy; frequently used to distinguish a true pressure from an osmotic pressure or to emphasize the variation in pressure in a column of fluid due to the effect of gravity. (05 Mar 2000) |
hydrostatical |
Of or relating to hydrostatics; pertaining to, or in accordance with, the principles of the equilibrium of fluids. "The first discovery made in hydrostatics since the time of Archimedes is due to Stevinus." (Hallam) Hydrostatic balance, a balance for weighing substances in water, for the purpose of ascertaining their specific gravities. Hydrostatic bed, a water bed. Hydrostatic bellows, an apparatus consisting of a water-tight bellowslike case with a long, upright tube, into which water may be poured to illustrate the hydrostatic paradox. Hydrostatic paradox, the proposition in hydrostatics that any quantity of water, however small, may be made to counterbalance any weight, however great; or the law of the equality of pressure of fluids in all directions. Hydrostatic press, a machine in which great force, with slow motion, is communicated to a large plunger by means of water forced into the cylinder in which it moves, by a forcing pump of small diameter, to which the power is applied, the principle involved being the same as in the hydrostatic bellows. Also called hydraulic press, and Bramah press. In the illustration, a is a pump with a small plunger b, which forces the water into the cylinder c, thus driving upward the large plunder d, which performs the reduced work, such as compressing cotton bales, etc. Origin: Hydro-, 1 + Gr. Causing to stand: cf. F. Hydrostatique. See Static. Source: Websters Dictionary (01 Mar 1998) |
hydrostatics |
<physics> The branch of science which relates to the pressure and equilibrium of nonelastic fluids, as water, mercury, etc.; the principles of statics applied to water and other liquids. Origin: Cf. F. Hydrostatique. Source: Websters Dictionary (01 Mar 1998) |
hydrosudopathy |
Synonym: hydrosudotherapy. Origin: hydro-+ L. Sudor, sweat, + G. Pathos, suffering (05 Mar 2000) |
hydrosudotherapy |
Hydrotherapy combined with induced sweating, as in the Turkish bath. Synonym: hydrosudopathy. (05 Mar 2000) |
hydrosulphate |
<chemistry> Same as Hydrosulphurent. Source: Websters Dictionary (01 Mar 1998) |
hydrosulphide |
<chemistry> One of a series of compounds, derived from hydrogen sulphide by the replacement of half its hydrogen by a base or basic radical; as, potassium hydrosulphide, KSH. The hydrosulphides are analogous to the hydrates and include the mercaptans. Source: Websters Dictionary (01 Mar 1998) |
hydrosulphite |
<chemistry> A saline compound of hydrosulphurous acid and a base. Source: Websters Dictionary (01 Mar 1998) |
hydrosulphuret |
<chemistry> A hydrosulphide. Source: Websters Dictionary (01 Mar 1998) |
hydrosulphureted |
<chemistry> Combined with hydrogen sulphide. Source: Websters Dictionary (01 Mar 1998) |
hydrosulphuric |
<chemistry> Pertaining to, or derived from, hydrogen and sulphur; as, hydrosulphuricacid, a designation applied to the solution of hydrogen sulphide in water. Origin: Hydro-, 2 + sulphuric. Source: Websters Dictionary (01 Mar 1998) |
Synonyms : Dehydrogenases, Hydroxysteroid
Synonyms :
Synonyms :
Synonyms :
Synonyms : Hydrea, Oncocarbide
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hydrodynamics
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The study of fluid motion.
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hydrogen ion
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A positively charged species of chemical, symbol H + , the ionized form of the hydrogen atom. The hydrogen ion is hydrated in aqueous solutions and is usually written as H 3 O + . Neutral water (pH 7) contains hydrogen ions at a concentration of 10 -7 mol L -1 . Dissolution of acids in water leads to an increase in the hydrogen ion concentration, and thus a decrease in the PH.
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hydrogen peroxide
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Strong oxidizing agent, formula H 2 O 2 , that is formed in the atmosphere from the reaction between two hydroperoxyl radicals Hydrogen peroxide is very soluble in water droplets, leading to a high rate of liquid-phase oxidation for soluble sulfur compounds, particularly sulfur dioxide.
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hydrogen sulfide
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Reduced sulfur gas, formula H 2 S, emitted by rotting vegetation; also found in emissions from terrestrial wetlands, marshes, etc. H 2 S is a common reduced sulfur gas in terrestrial systems.
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hydrogen chloride
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A toxic, colorless, strongly acidic gas (HCl) that dissolves readily in water to form hydrochloric acid. In the troposphere, hydrochloric acid can be produced from the reaction of nitric acid or sulfuric acid with sea-salt particles (NaCl). It is also involved in the formation of ammonium chloride aerosol. HCl is also the most abundant form of chlorine in an inorganic compound found in the stratosphere. ...
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