hardness is a Noun
[1] The quality or state of being hard, literally or figuratively. The habit of authority also had given his manners some peremptory hardness. Sir W. Scott.
[2] The cohesion of the particles on the surface of a body, determined by its capacity to scratch another, or be itself scratched;-measured among minerals on a scale of which diamond and talc form the extremes.
[3] The peculiar quality exhibited by water which has mineral salts dissolved in it. Such water forms an insoluble compound with soap, and is hence unfit for washing purposes.
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