Hardness :: Hardness (n.) The quality or state of being hard, literally or figuratively..

Hardness :: Hardness (n.) 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..

Hardness :: Hardness (n.) 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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