hard water

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  • noun

Antonyms for hard water

water that contains mineral salts (as calcium and magnesium ions) that limit the formation of lather with soap

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References in periodicals archive ?
For example, the Rockwell hardness scales are distinguished by the amount of static force applied (e.
Hardness scales are only in relationship to themselves," Frank says.
The Mohr or the Knoop hardness scales have been used to compare the hardness of various materials for both materials of construction of the mixer, as well as for the fillers that are being mixed.
Since 1997, NIST and other national metrology institutes have been working on the establishment of worldwide-unified Rockwell hardness scales (1).
They both agreed that there was some correlation between the type A durometer and BS hardness scales.