| 释义 |
hard water
hard water - That which contains large amounts of minerals.See also related terms for minerals.Hard waterWater 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.Thesaurus| Noun | 1. | hard water - water that contains mineral salts (as calcium and magnesium ions) that limit the formation of lather with soapH2O, 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 solventsoft water - water that is not hard (does not contain mineral salts that interfere with the formation of lather with soap) |
hard water
hard water[′härd ¦wȯd·ər] (chemistry) Water that contains certain salts, such as those of calcium or magnesium, which form insoluble deposits in boilers and form precipitates with soap. hard waterWater containing solutions of mineral salts (sulfates of calcium and magnesium, carbonates, and bicarbonates). Also see water softener.See hard water
hard water
hard wa·terwater containing ions, such as Mg2+ and Ca2+, that form insoluble salts with fatty acids so that ordinary soap will not lather in it.Water with a high content of calcium and magnesium salts—e.g., carbonates and sulphates—which may interfere with certain lab testshard water Water with a high content of calcium and magnesium salts–eg, carbonates and sulfates, which may interfere with certain lab tests. See Mineral water, Spring water; Cf Soft water. hard wa·ter (hahrd wawtĕr) That containing ions, such as Mg2+ and Ca2+, which form insoluble salts with fatty acids so that ordinary soap will not lather in it.
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Related to hard water: water softenerAntonyms for hard waternoun water that contains mineral salts (as calcium and magnesium ions) that limit the formation of lather with soapRelated WordsAntonyms |