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- Chemistry; Chem Sci/Eng
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- 硬水是含有較多可溶性鈣、鎂等化合物的水。所有自然的淡水中都多多少少含有鈣、鎂等礦物質的, 比方說如果水流過石灰, 硬度就會增加；而如果流過泥煤, 硬度就會下降。
维基百科 - by Han Li
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- 所谓"硬水"是指水中所溶的矿物质成分多，尤其是钙和镁。硬水并不对健康造成直接危害，但是会给生活带来好多麻烦，比如用水器具上结水垢、肥皂和清洁剂的洗涤效率减低等。
- 东利网
 by Han Li - 钙镁离子含量较多的水称为硬水，钙镁离子含量较少的水称为软水。硬水与软水只是通俗上的叫法，并没有标准的量的概念，在生活中，行内一般把硬度低于3mmol/L的水称为较软的水，3-6称为普通水，6-8称为较硬的水，10以上称为高硬水。
- Supesite by Han Li
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Compare [close] - Croatian
- 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
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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
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