permanent hardness

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noun

chem hardness of water that cannot be removed by boiling as it results mainly from the presence of calcium and magnesium chlorides and sulphates

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In the UK, COTTON CANDY is more commonly known as…

candystring

candyfloss

candypuff

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Words nearby permanent hardness

permanence, permanency, permanent, Permanent Court of Arbitration, permanent echo, permanent hardness, permanent health insurance, permanent magnet, permanent mold, permanent press, permanent resident

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

How to use permanent hardness in a sentence

The total hardness of water is therefore commonly made up of temporary and permanent hardness.
Scientific American Supplement, No. 392, July 7, 1883|Various
Boiling the water does not affect these salts; hence such waters are said to have permanent hardness.
An Elementary Study of Chemistry|William McPherson
The hardness of water may be of two kinds,— temporary hardness and permanent hardness.
An Elementary Study of Chemistry|William McPherson
Calcium sulphate, or gypsum, on the other hand, imparts permanent hardness.
Human Foods and Their Nutritive Value|Harry Snyder

Permanent hardness is caused by other compounds of lime that are not precipitated by boiling the water.
Woman's Institute Library of Cookery, Vol. 1|Woman's Institute of Domestic Arts and Sciences