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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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