hard water

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hard water

- That which contains large amounts of minerals.
See also related terms for minerals.

Hard water

Water that contains an appreciable amount of dissolved salts of calcium and magnesium. Such salts interfere with the action of soap. In the early days of the twentieth century, most rural water came from wells, and most of it was hard. Indeed, in some places, it was reputed to be so hard that a rock dropped into the well would bounce when it hit the water. Slight amounts of dissolved material in drinking water were often preferred because of the taste, but soft water was preferred for washing hair and clothes.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.hard water - water that contains mineral salts (as calcium and magnesium ions) that limit the formation of lather with soap
H2O, water - binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent
soft water - water that is not hard (does not contain mineral salts that interfere with the formation of lather with soap)
References in periodicals archive ?
Measuring coating hardness is now more accurate, repeatable and reproducible than ever before, thanks to the new Elcometer 3045 Pendulum Hardness Tester.
Using the normal measuring-head, the instrument functions as a depth-sensitive hardness tester in the micro range.
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Abstract: The hardness tester presented in the paper is a portable testing equipment for hardness test with static load, for metals and metal alloys, being able to operate both with manual applied load and with applied load through a mobile table of its own frame or through work table of a machine tool in the latter case hardness tester being mounted on machine head that processes components.
Another Proceq classic was released in the 1970s with the ''Equotip'' metal hardness tester.
Product Feature: BAREISS Digi-Test II hardness tester
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The most drastic change to hardness testing was the introduction of NIST hardness reference test blocks as opposed to a new type of hardness tester, Fultz says.
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