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Meanings of permanent hardness in English
We have no meanings for "permanent hardness" in our records yet.
Usage of permanent hardness in English
1
The total hardness of water is therefore commonly made up of temporary and permanent hardness.
2
Indeed, in the phraseology of a water-analyst, I may say that the sap itself has 25 degrees of total, permanent hardness.
3
Such heaters are frequently used with a reagent for precipitating permanent hardness in the combined heat and chemical treatment of feed water.
4
Extravasion under the skin, especially in the lower extremities may be followed by permanent hardness (induration) and stiffness due to connective tissue infiltration (scurvy sclerosis).
5
Permanent hardness is caused by other compounds of lime that are not precipitated by boiling the water.