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    • Hindi
      • Chemistry; Chem Sci/Eng
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          • Term
            • कठोर जल
          • Additional fields of expertise
          • Definition(s)
            • कठोर जल उसे कहा जाता है जिसमें कैल्शियम और मैगनीशियम की मात्रा अधिक होती है। http://hindi.indiawaterportal.org/ - by Lalit Sati
          • Example sentence(s)
            • आम प्रयोग में ‘उच्च-टीडीएस जल’ को ‘कठोर जल’ के समानर्थी के रूम में इस्तेमाल किया जाता है। वैज्ञानिक प्रयोग में उच्च टीडीएस जल का मतलब उसमें घुले सोडियम, पोटेशियम, कैल्शियम, मैग्नीशियम, कार्बोनेट. बाईकार्बोनेट, क्लोराइड, सल्फेट जैसे पदार्थों की घुली मात्रा से है। दूसरी ओर जल की कठोरता से मतलब कैल्शियम और मैग्नीशियम से है जिसे एमजी/लीटर सीएसीओ३ से व्यक्त किया जाता है। कठोरता की मात्रा के अनुसार अगर इसकी मात्रा 60 से कम होती है तो उसे मृदु जल कहा जाता है। 61 से 120 के बीच होने पर थोड़ा कठोर और 121 से 180 के बीच होने पर कठोर और 180 से अधिक होने पर बहुत कठोर कहा जाता है। ऐसे में कठोरता और उच्च टीडीएस को समानार्थक के रूप में न इस्तेमाल करना ही बेहतर है ताकि भ्रम की स्थिति से बचा जा सके। - http://hindi.indiawaterportal.org/ by Lalit Sati
            • ऐसे जल को कठोर जल, (Hard water) कहते हैं जिसमें खनिज लवणों की अधिकता हो। इसमें कैल्शियम व मैग्नीशियम के बाइकार्बोनेट व कार्बोनेट उपस्थित रहते हैं । - http://hi.wikipedia.org/wiki by Lalit Sati
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    • Macedonian
      • Chemistry; Chem Sci/Eng
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          • Term
            • тврда вода
          • Additional fields of expertise
          • Definition(s)
            • Тврдата вода е вода што содржи растворени соли на калциум и магнезиум (понекогаш и железо). Own research - by Milena Chkripeska
          • Example sentence(s)
            • Ако високите TDS отчитувања се должат на јоните од тврда вода, тогаш сапуните може да бидат помалку ефикасни или пак, во цевките од грејните тела може да се создадат наслаги. - Интернет by Milena Chkripeska
            • ТЕСТИРАЊАТА ПОКАЖАА ДЕКА ВОДАТА ШТО ЈА ПИЈАТ НАЈГОЛЕМИОТ БРОЈ ХРВАТИ Е ТВРДА И ЗДРАВСТВЕНО ИСПРАВНА, БЕЗ РАЗЛИКА ДАЛИ Е ОД ВОДОВОДИТЕ ИЛИ Е ПАКУВАНА ВО ШИШИЊА - Вечер by Milena Chkripeska
            • о, според информациите добиени од Републичкиот завод за здравствена заштита, кој е еден од четирите институции во Македонија кои го мерат квалитетот на водата, кај нас има проблем само со квалитетот (тврда вода), што е технички проблем, а барем засега немаме проблеми со квантитетот на водата. - Време by Milena Chkripeska
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    • English
      • Chemistry; Chem Sci/Eng
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          • Term
            • hard water
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          • Definition(s)
            • 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
            • 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
            • Clothes washed in hard water often look dingy and feel harsh and scratchy. - sciLinks
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    • Portuguese
      • Chemistry; Chem Sci/Eng
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          • Term
            • Água dura
          • Additional fields of expertise
          • Definition(s)
            • Água rica em minerais de cálcio e magnésio, principalmente carbonatos. Own research - by Marcelo Lino
          • Example sentence(s)
            • 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
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    • German
      • Chemistry; Chem Sci/Eng
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          • Term
            • hartes Wasser
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          • Definition(s)
            • Hartes Wasser hat eine hohe Konzentration an Ca2+ and Mg2+ Ionen. Bei der Reaktion der Erdalkali-Ionen mit Seife entstehen Niederschläge, die sich auf Textilfasern ablagern und deren Entfärbung verursachen können. Universität Regensburg FB Chemie - by Marion Schweizer
          • Example sentence(s)
            • In hartem Wasser ist die Wirksamkeit der Seife stark eingeschränkt. Hartes Wasser bedeutet einen höheren Seifenverbrauch. Die bis zur vollständigen Ausfällung der Härtebildner zugesetzte Seife geht für den Waschprozess verloren. Darüberhinaus wird ein Teil der Seife auch noch benötigt, um die entstandene Kalkseife in der Waschlauge zu dispergieren. - Universität Regensburg FB Chemie by Marion Schweizer
            • Was ist hartes Wasser? Was macht das Trinkwasser hart? Trinkwasser enthält je nach Herkunft (Oberflächen-, Grund- oder Quellwasser) unterschiedliche Mengen der beiden Mineralstoffe Calcium und Magnesium. Die Härte von Wasser wird durch die Menge gelöster Calcium- und Magnesiumverbindungen ("Kalk") charakterisiert. Je höher der Gehalt, desto härter das Wasser. Das neue Wasch- und Reinigungsmittelgesetz (am 1. Mai 2007 in Kraft getreten) unterscheidet nur noch drei statt bisher vier Härtebereiche. Die Menge der im Wasser gelösten Calcium-Ionen (nicht jedoch der Magnesiumgehalt) entscheidet darüber, in welchen Härtebereich das Wasser einzuordnen ist. - Verband d. Energie- und Wasserwirtschaft by Marion Schweizer
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    • Czech
      • Chemistry; Chem Sci/Eng
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          • Term
            • tvrdá voda
          • Additional fields of expertise
          • Definition(s)
            • 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
          • Example sentence(s)
            • 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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