HARD WATER • DICCIONARIO INGLES.COM • Definition of Hard water

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/hɑrd wˈɔtər/ Listen

Hard water

noun

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

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Etymology of 'Hard water'

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"Hard water" Quotes from Famous Books

... your clothes in dirty water. Bathing in water containing much alkali (hard water) or fine sand or mud will make the skin smart or chafe easily and ...

— Manual of Military Training - Second, Revised Edition • James A. Moss

... of lime, originating from hard water being used instead of soft, in the preparation of ...

— A Treatise on Adulterations of Food, and Culinary Poisons • Fredrick Accum

... occasion some short time ago to examine a hard water which owed half its hardness to salts of magnesium, I noticed that the soap test, applied in the usual way, gave a result which differed very much from that obtained by the quantitative estimation of calcium and magnesium. A perfectly normal lather ...

— Scientific American Supplement, No. 441, June 14, 1884. • Various

... contain a great deal of gypsum, or natural sulphate of lime, and this is soluble to some extent in water. Water thus hardened is not affected by boiling, or the addition of lime, and is therefore termed permanently hard water, the water hardened with dissolved chalk being termed temporarily hard water. I have said nothing of solid or undissolved impurities in water, which are said to be in suspension, for the separation of these is a merely mechanical matter ...

— The Chemistry of Hat Manufacturing - Lectures Delivered Before the Hat Manufacturers' Association • Watson Smith

Words linked to "Hard water" : water, soft water, H2O