hard water

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Related to Water hardness: water softener

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 ?
Projects during the fall term include quantitative analyses of water hardness, alkalinity and dissolved oxygen to assess the health of aquatic resources; the concentration of copper, lead and zinc in digested plant samples collected from two areas of concern from point source and non-point source pollution; and concentration and form of macronutrients in soil to include nitrogen, phosphate and potassium as well as salinity, ion exchange capacity, and pH to determine soil productivity.
Water hardness was related to the occurrence of urolithiasis in Turkey where the mean hardness of water sampled was 285 ppm (285 mg [l.
Studies of children in the United Kingdom, Spain, and Japan show the prevalence of AD is significantly higher in the highest water hardness categories than that in the lowest.
Water hardness due to Ca, Mg and Fe with different anions has been considered.
Materials and Methods: Water samples from different districts of KPK, Pakistan, were collected and their hardness values were estimated to find the water sample of maximum and minimum water hardness in order to know the maximum hardness hair would encounter in KPK, Pakistan.
Several studies have demonstrated the protective effect of water hardness against metal toxicity to algae.
The investigators observed significantly lower diastolic blood pressure as well as lower levels of serum triglycerides and creatinine in the area with the highest total water hardness.
A number of studies in various part of the world have demonstrated that there was statistically significant negative correlation between water hardness and cardiovascular disease.
8220;Households across various regions in the US experience high water hardness and contamination issues.
I am now a university student in Sharjah and I happen to be working on a water experiment in university and the common opinion is that water hardness in Shajrah is very high comparing to other emirates -- I'll find out soon.