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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…
Words nearby permanent hardness
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.
Boiling the water does not affect these salts; hence such waters are said to have permanent hardness.
The hardness of water may be of two kinds,— temporary hardness and permanent hardness.
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