hard water

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hard water

- That which contains large amounts of minerals.
See also related terms for minerals.
Farlex Trivia Dictionary. © 2012 Farlex, Inc. All rights reserved.

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.
1001 Words and Phrases You Never Knew You Didn’t Know by W.R. Runyan Copyright © 2011 by W.R. Runyan
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)
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References in periodicals archive ?
The pH is dependent upon various factors like water hardness, dissolved minerals, oxygen level and many more situations.
Temperature was maintained at 23-25[degrees]C, pH at 7.4, dissolved oxygen at 7.2mg [L.sup.-1], water hardness at 20mg CaC[O.sub.3] [L.sup.-1], maximum unionized ammonia level at 0.007mg [L.sup.-1], and maximum nitrite level at 0.04mg [L.sup.-1].
Since the 1950s, several epidemiologic studies have demonstrated an inverse relation between water hardness and cardiovascular disease (CVD) (Crawford et al.
The products will be evaluated under a range of conditions including nine stains on two fabrics at three water hardness, three temperatures and three use concentrations.
Adjust solution strength depending on current bactoscan levels and water hardness. Continue normal pattern of descaling and use of milk stone remover.
SGS also has three levels of water hardness available at its improved and expanded testing facilities.
Also, the team did not control for factors such as density of older housing, and they were unable to control for the solubility of lead in pipes affected by different temperatures and water hardness.
Complexometric determination of calcium: EDTA titrimetric method for hardness of water: Test strips for water hardness. Sodium determination: Ion selective electrodes: Mohr titration: Quantab test strips.
2004), and in Spain, the RIF was used to study relationships between drinking water hardness and cardiovascular and cerebrovascular mortality, using health and water quality data at municipality level (Ferrandiz et al.
Previously published scientific papers have reported a negative correlation between drinking water hardness and cardiovascular mortality.