Printer Friendly
Dictionary, Encyclopedia and Thesaurus - The Free Dictionary
3,899,243,465 visitors served.
forum Join the Word of the Day Mailing List For webmasters
?
Dictionary/
thesaurus
Medical
dictionary
Legal
dictionary
Financial
dictionary
Acronyms
 
Idioms
Encyclopedia
Wikipedia
encyclopedia
?

hard water
(redirected from Water hardness)

    Also found in: Dictionary/thesaurus, Medical, Wikipedia 0.01 sec.

hard water

Water that contains mineral salts of calcium and magnesium, principally as bicarbonates, chlorides, and sulfates, and sometimes iron. Hardness caused by calcium bicarbonate is known as temporary, because boiling converts the bicarbonate to the insoluble carbonate; hardness from the other salts is called permanent. The calcium and magnesium in hard waters form a hard, adherent scale on boiler plates, increasing fuel consumption and leading to deterioration through overheating. Home water softeners consist of tanks containing zeolite minerals or ion-exchange resins, which contain sodium ions that change places with the calcium and magnesium.

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 water
Water containing solutions of mineral salts (sulfates of calcium and magnesium, carbonates, and bicarbonates). Also see water softener.
Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content.
?Page tools
Printer friendly
Cite / link 		Feedback
Mentioned in?  References in periodicals archive?   Encyclopedia browser?   Full browser?
No references found
 
As experts say, it contributes 97% of water hardness and the rest are just minute amounts.
Pool Pebble the Importance of Maintaining the Right Calcium Levels ... by Chris Turley / Home based business community
A new modern hardness measurement without the use of indicators enables fully automatic adjustment of softener cycles to the specific raw water hardness.
Elegant and cost-effective from Christ by Pharma
Siemens also announces the new Ionpure VNX-HH electrodeionization (EDI) module, which represents a significant advancementin feed water hardness tolerance, to two parts per million (ppm) as CaCO3 - a hardness level that is four times the industry standard of 0.
Siemens Highlights R&D Efforts, Regional Activities at Singapore ... by JCN Newswires
 
 
 
Encyclopedia
?

Terms of Use | Privacy policy | Feedback | Advertise with Us | Copyright © 2012 Farlex, Inc.
Disclaimer
All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.