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- Chemistry; Chem Sci/Eng
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- Hard water is water contaminated with compounds of calcium and magnesium. Dissolved iron, manganese, and strontium compounds can also contribute to the "total hardness" of the water, which is usually expressed as ppm CaCO3. Water with a hardness over 80 ppm CaCO3 is often treated with water softeners, since hard water produces scale in hot water pipes and boilers and lowers the effectiveness of detergents. antoine.frostburg.edu
- Example sentence(s)
- Some laundry detergents do not produce as many suds in hard water, these are likely to be soap-based products and do not work as well in hard-water as detergent based products. - water-treatment.org.uk
![](https://cfcdn.proz.com/images/wikiwords/small_grey_arr.gif) - Hard water also contributes to inefficient and costly operation of water-using appliances. Heated hard water forms a scale of calcium and magnesium minerals that can contribute to the inefficient operation or failure of water-using appliances. - Wilkes University
![](https://cfcdn.proz.com/images/wikiwords/small_grey_arr.gif) - Clothes washed in hard water often look dingy and feel harsh and scratchy. - sciLinks
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- Chemistry; Chem Sci/Eng
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- Твърда вода е вода с високо съдържание на минерали, обикновено калциеви и магнезиеви (Mg2+) йони, и в някои случаи други разтворени елементи като бикарбонати и сулфати. Противоположното понятие е мека вода - вода с ниско минерално съдържание.
Калцият във водата обикновено се намира или като калциев карбонат (CaCO3) или като калциев сулфат (CaSO4). Wikipedia - by bibienne (X)
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- Твърда вода е вода с високо съдържание на минерали, обикновено калциеви и магнезиеви (Mg2+) йони, и в някои случаи други разтворени елементи като бикарбонати и сулфати.
- Wikipedia
by bibienne (X) - Ефективността на перилните препарати при употреба в твърда вода се понижава многократно, в резултат на получаването на неразтворими калциеви и магнезиеви соли на висшите мастни киселини. - Internetreklama
by bibienne (X) - Related KudoZ question
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- Chemistry; Chem Sci/Eng
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- Tvrda voda je uzrokovana prisustvom otopljenih soli kalcija i magnezija (nekada i željeza). Prolazna (privremena) tvrdoća potiče od kalcija i hidrogenkarbonata i uklanja se kuhanjem.Stalna tvrdoća se odnosi na sulfate i kloride kalcija i magnezija. Wikipedia - by vladowsky
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- Vode s mineralnih i termalnih izvora obiluju kalcijem i magnezijem i uvijek imaju visoki stupanj tvrdoće. Kada govorimo o konzumnoj vodi, problem se ne zove TVRDA VODA nego KAMENAC koji se javlja kao posljedica transporta kroz vodovodne instalacije i promjene pritiska i temperature tijekom njezina iskorištavanja. Omekšana voda potrebna je u mnogim proizvodnim procesima ali nije pogodna za ljudsko zdravlje. - Agromarketing
by vladowsky - Related KudoZ question
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- Chemistry; Chem Sci/Eng
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- Água rica em minerais de cálcio e magnésio, principalmente carbonatos. Own research - by Marcelo Lino
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- Dureza da água é a propriedade relacionada com a concentração de íons de determinados minerais dissolvidos nesta substância. A dureza da água é predominantemente causada pela presença de sais de Cálcio e Magnésio, de modo que os principais íons levados em consideração na medição são os de Cálcio (Ca+) e (Mg+)
- Wikipedia
by Marcelo Lino - O tratamento da água dura para a retirada de Ca2+ e Mg2+ é conhecido por abrandamento ou amolecimento e consiste em fazer a água atravessar uma resina que captura os íons Ca2+ e Mg2+, substituindo-os por íons não prejudiciais ao homem, tais como o Na+ e o H+. - UENF
by Marcelo Lino - Related KudoZ question
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- Chemistry; Chem Sci/Eng
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- Tvrdost vody je vlastnost, která vyjadřuje obsah rozpuštěných nerostů (nejčastěji CaO a MgO) ve vodě. Tvrdost vody má význam pro její využití jako pitné i užitkové vody. Je zdrojem tvorby vodního i kotelního kamene, a ovlivňuje i chuťové vlastnosti vody.
V českých zemích se tvrdost vody měřila v tzv. německých stupních, kde jeden stupeň odpovídá 10 mg CaO/litr nebo 7,2 mg MgO/litr.
tvrdá voda - víc jak 18°-25°
Wikipedia - by Jiri Farkac
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- Kotelní kámen je směs minerálů, které se vylučují ve formě pevného povlaku na stěnách nádoby, v níž dochází k varu tvrdé vody. - Wikipedia
by Jiri Farkac - Related KudoZ question
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