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- Q2085434 subject Q5828462.
- Q2085434 abstract "Degrees of general hardness (dGH) 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 and magnesium (Ca2+, Mg2+) per volume of water. Specifically, 1 dGH is defined as 10 milligrams (mg) of calcium oxide (CaO) per litre of water, which is equivalent to 0.17832 mmol per litre of elemental calcium and/or magnesium ions, since CaO has a molar mass of 56.0778 g/mol.In water testing, paper strips often measure hardness 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 17.848 ppm, since CaCO3 has a molar mass of 100.0875 g/mol.".
- Q2085434 wikiPageExternalLink hardness-larryfrank.html.
- Q2085434 wikiPageExternalLink masswas.shtml.
- Q2085434 wikiPageWikiLink Q145623.
- Q2085434 wikiPageWikiLink Q185006.
- Q2085434 wikiPageWikiLink Q22988272.
- Q2085434 wikiPageWikiLink Q23767.
- Q2085434 wikiPageWikiLink Q41509.
- Q2085434 wikiPageWikiLink Q4354760.
- Q2085434 wikiPageWikiLink Q47574.
- Q2085434 wikiPageWikiLink Q5283814.
- Q2085434 wikiPageWikiLink Q5828462.
- Q2085434 wikiPageWikiLink Q660.
- Q2085434 wikiPageWikiLink Q706.
- Q2085434 comment "Degrees of general hardness (dGH) 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 and magnesium (Ca2+, Mg2+) per volume of water.".
- Q2085434 label "DGH".