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temporary hardness

British

noun

chem hardness of water due to the presence of magnesium and calcium hydrogencarbonates, which can be precipitated as carbonates by boiling

"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

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With the limited data at hand it is impracticable to determine these figures, but an increase of 2 per cent in the quantity of copper for each part per 100,000 of organic matter and an increase of 0.5 to 5 per cent in the proportion of copper for each part per 100,000 of temporary hardness will possibly be found correct.

From Project Gutenberg

Similar scales should be arranged for the organic content and the temporary hardness of the water.

From Project Gutenberg

Temporary hardness 20.000 14.0000 Permanent do 245.000 171.5000 Total do.

From Project Gutenberg

To what is temporary hardness in water due?

From Project Gutenberg

Most natural waters contain it dissolved in carbonic acid; this confers "temporary hardness" on the water.

From Project Gutenberg

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