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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IS and ARE are both forms of which verb?

have

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Words nearby permanent hardness

permanent, permanent cartilage, Permanent Court of Arbitration, permanent dentition, 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 offices were firebombed in 2011; no one was hurt but a permanent police car was subsequently stationed outside.
France Mourns—and Hunts|Nico Hines, Christopher Dickey|January 8, 2015|DAILY BEAST
Plus, while sometimes IPs can be “permanent”, at other times IPs last just a few seconds.
No, North Korea Didn’t Hack Sony|Marc Rogers|December 24, 2014|DAILY BEAST
In the past, Fidel Castro and his brother Raul were considered permanent enemies of Washington.
Cuba Is A Kleptocracy, Not Communist|Romina Ruiz-Goiriena|December 19, 2014|DAILY BEAST
At least one parent would have to be a U.S. citizen or permanent resident.
The Progressive Case Against Birthright Citizenship|Keli Goff|December 15, 2014|DAILY BEAST

They seemed like a permanent part of the mindscape, the way mountains or rivers are part of the physical world.
Alfred Hitchcock’s Fade to Black: The Great Director’s Final Days|David Freeman|December 13, 2014|DAILY BEAST
Let them open their minds to us, let them put upon permanent record the significance of all their intrigues and manœuvres.
The Salvaging Of Civilisation|H. G. (Herbert George) Wells
Will this position be permanent or will its duration be limited practically to the period of the war?
Readings in Money and Banking|Chester Arthur Phillips
There is a sharp curve in the permanent way outside the station, so that a train is on you all of a sudden.
Uncanny Tales|Various
Loss, where she was concerned, involved a permanent and irremediable bereavement—no substitute was conceivable.
The Wave|Algernon Blackwood
Our troops have done all that flesh and blood can do against semi-permanent works, and they are not able to carry them.
Gallipoli Diary, Volume I|Ian Hamilton