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Vietnamese
- Chemistry; Chem Sci/Eng
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    - Term
      - nước cứng
    - Additional fields of expertise
      - Chemistry; Chem Sci/Eng
      - Environment & Ecology
    - Definition(s)
      - Nước cứng là loại nước tự nhiên chứa trên ba mili đương lượng gam cation canxi (Ca2+) và magie (Mg2+) trong một lít. Nước chứa nhiều Mg2+ có vị đắng. Tổng hàm lượng ion Ca2+ và Mg2+ đặc trưng cho tính chất cứng của nước. Ngày nay, người ta còn tính cả ion Fe2+ và Na+ vào độ cứng. Độ cứng của nước thiên nhiên dao động rất nhiều và đặc trưng lớn ở nước ngầm. Bách khoa toàn thư mở Wikipedia - by Ba Nguyen Thi Thu
    - Example sentence(s)
      - Nước có độ cứng tạm thời lớn hơn 100 ppm được coi là nước cứng, dưới mức đó được coi là nước mềm. - Diễn đàn Chim - Cá Cảnh Việt Na by Ba Nguyen Thi Thu
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Japanese
- Chemistry; Chem Sci/Eng
  - Search
    - Term
      - 硬水
    - Additional fields of expertise
      - Chemistry; Chem Sci/Eng
      - Environment & Ecology
    - Definition(s)
      - 硬水（こうすい）は、硬度の高い水。カルシウムイオンやマグネシウムイオンが多量に含まれている。アメリカやヨーロッパの水に多い。逆のものは軟水という。 wikipedia - by keiko miyazaki
    - Example sentence(s)
      - 生活用水や飲料水をその成分で分類したときに「軟水」、「硬水」という言葉を使います。軟水・硬水の基準は「硬度」で決まります。 - サントリー by keiko miyazaki
    - Related KudoZ question

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Arabic
- Chemistry; Chem Sci/Eng
  - Search
    - Term
      - ماء عسر
    - Additional fields of expertise
      - Chemistry; Chem Sci/Eng
      - Environment & Ecology
    - Definition(s)
      - ماء لا يرغي فيه الصابون لاحتوائه على أيوني Mg2+ , Ca2+i . عسر الماء نوعان : دائم ومؤقت ،... مسرد المصطلحات الكيمي - by Dr. Ola Siam
    - Example sentence(s)
      - تتوافرايونات كل من Ca+2, Mg+2, SO4-2, CO3-2 and HCO3- في الماء العسر - www.reefnet.gov.sy by Dr. Ola Siam
    - Related KudoZ question

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Hebrew
- Chemistry; Chem Sci/Eng
  - Search
    - Term
      - מים קשים
    - Additional fields of expertise
      - Chemistry; Chem Sci/Eng
      - Environment & Ecology
    - Definition(s)
      - מים המכילים ריכוז גבוה של מגנזיום וסידן. בדרך כלל קשיות המים מבוטאת בחל"מ של סידן פחמתי. Own research - by Pavel Parkhomyuk (X)
    - Example sentence(s)
      - המים היורדים כמשקעים, סופחים מהאדמה מינרלים ומלחים בינהם סידן ומגנזיום. מים מוגדרים כ"קשים" כאשר יש בהם כמות גדולה של המינרלים, סידן ומגנזיום. המים בישראל מוגדרים כ"קשים" עד "קשים מאוד". - תמהיל by Pavel Parkhomyuk (X)
      - אולם אין כל צורך לרכך מים המיועדים לשתיה אלא אם המים מאוד קשים כך שיש להם טעם לא טוב - מכון התקנים הישראלי by Pavel Parkhomyuk (X)
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French
- Chemistry; Chem Sci/Eng
  - Search
    - Term
      - eau dure
    - Additional fields of expertise
      - Chemistry; Chem Sci/Eng
      - Environment & Ecology
    - Definition(s)
      - Une eau dure est une eau qui contient beaucoup de sels dissous, comme les sels de calcium (le carbonate de calcium ou calcaire par exemple) et de magnésium. CNRS - by Natacha DAMBINOFF
    - Example sentence(s)
      - Il n’y a aucun danger à boire une eau dure lorsqu’on est en bonne santé. - CNRS by Natacha DAMBINOFF
    - Related KudoZ question

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