24 lines
1.3 KiB
Markdown
24 lines
1.3 KiB
Markdown
---
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title: "DGH"
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chunk: 1/1
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source: "https://en.wikipedia.org/wiki/DGH"
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category: "reference"
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tags: "science, encyclopedia"
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date_saved: "2026-05-05T11:27:17.667182+00:00"
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instance: "kb-cron"
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---
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Degrees of general hardness (dGH or °GH) is a unit of water hardness, specifically of general hardness. General hardness is a measure of the concentration of divalent metal ions such as calcium (Ca2+) and magnesium (Mg2+) per volume of water. Specifically, 1 dGH is defined as 10 milligrams (mg) of calcium oxide (CaO) per litre of water. Since CaO has a molar mass of 56.08 g/mol, 1 dGH is equivalent to 0.17832 mmol per litre of elemental calcium and/or magnesium ions.
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In water testing hardness is often measured in parts per million (ppm), where one part per million is defined as one milligram of calcium carbonate (CaCO3) per litre of water. Consequently, 1 dGH corresponds to 10 ppm CaO but 17.848 ppm CaCO3 which has a molar mass of 100.09 g/mol.
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== See also ==
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Carbonate hardness
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Hard water
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dKH
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== References ==
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Frank, Larry (1997-12-16). "Water Hardness". The Krib. Archived from the original on 2018-10-24. Retrieved 2011-11-04.
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Krüger, Bernd (2022). "Wasserhärte [de] / Dureté de l'eau [fr]" [Hardness of water]. Cactus2000 (in German, English, and French). Archived from the original on 2021-02-22. Retrieved 2009-01-23. |