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water hardness

См. также в других словарях:

  • water hardness — the concentration of calcium and magnesium ions in water expressed as p.p.m. or mg/l of calcium carbonate equivalents. Water hardness expressed in degrees of hardness. 0 4 is very soft, 5 8 soft, up to 30 which is extremely hard water. Note that… …   Dictionary of ichthyology

  • water hardness — vandens kietis statusas T sritis Standartizacija ir metrologija apibrėžtis Vandenyje ištirpusių Ca ir Mg druskų kiekis. atitikmenys: angl. water hardness vok. Wasserhärte, f rus. жесткость воды, f pranc. dureté de l’eau, f …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • water hardness — vandens kietumas statusas T sritis chemija apibrėžtis Vandenyje ištirpusių Ca ir Mg druskų kiekis. atitikmenys: angl. water hardness rus. жесткость воды …   Chemijos terminų aiškinamasis žodynas

  • degrees of water hardness — dGH (water hardness expressed in degrees of hardness. 0 4 is very soft, 5 8 soft, up to 30 which is extremely hard water). Note that different countries use different measures: 1 English (Clark) degree is 14.3 p.p.m. calcium carbonate, 1 American …   Dictionary of ichthyology

  • Water — This article is about general aspects of water. For a detailed discussion of its properties, see Properties of water. For other uses, see Water (disambiguation) …   Wikipedia

  • Water purification — This article is about large scale, municipal water purification. For portable/emergency water purification, see portable water purification. For industrial water purification, see deionized water. For distilled water, see distilled water. Water… …   Wikipedia

  • Hardness — Hard ness, n. [AS. heardness.] 1. The quality or state of being hard, literally or figuratively. [1913 Webster] The habit of authority also had given his manners some peremptory hardness. Sir W. Scott. [1913 Webster] 2. (Min.) The cohesion of the …   The Collaborative International Dictionary of English

  • hardness — water with a high mineral content, the name deriving from the fact that it is hard to develop a lather for cleaning. The concentration of calcium and magnesium ions in water is expressed as p.p.m. or mg/l of calcium carbonate equivalents. Soft… …   Dictionary of ichthyology

  • Water supply and sanitation in the European Union — still is under the responsibility of each member state. Nevertheless, the European Union established some policies which impact the National water strategies tremendously. However, WSS evolved in every Member State independently until the… …   Wikipedia

  • Water softening — A water softener reduces the dissolved calcium, magnesium, and to some degree manganese and ferrous iron ion concentration in hard water.These hardness ions cause three major kinds of undesired effects. Most visibly, metal ions react with soaps… …   Wikipedia

  • hard water — water that contains magnesium, calcium, or iron salts and therefore forms a soap lather with difficulty. * * * Water that contains mineral salts of calcium and magnesium, principally as bicarbonates, chlorides, and sulfates, and sometimes iron.… …   Universalium

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