1. See also

2. External links

Degrees of carbonate hardness (dKH or °KH; the K is from the German Karbonathärte) is a unit of water hardness, specifically for temporary or carbonate hardness. Carbonate hardness is a measure of the concentration of carbonates such as calcium carbonate (CaCO₃) and magnesium carbonate (MgCO₃) per volume of water. Specifically, 1 dKH is defined as 17.86 milligrams (mg) of calcium carbonate per litre of water, i.e. 17.86 ppm. Since a mole of calcium carbonate weighs 100.09 grams, 1 dKH is equivalent to 0.17832 mmol per litre.

dKH are the same as °fH, degrees of French hardness.

See also

• Carbonate hardness
• Hard water
• dGH

External links

• Water Hardness definitions
• [https://www.cactus2000.de/uk/unit/masswas.shtml Convertor for Hardness of water]
• [https://www.corrosionpedia.com/definition/1071/temporary-hardness What is Temporary Hardness]

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