Meaning of HARDNESS
| Pronunciation: | | 'hârdnis
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 WordNet Dictionary |
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- [n] excessive sternness; "severity of character"; "the harshness of his punishment was inhuman"; "the rigors of boot camp"
- [n] the quality of being difficult to do; "he assigned a series of problems of increasing hardness"
- [n] devoid of passion or feeling
- [n] the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale
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| | Synonyms: | | callousness, harshness, inclemency, insensibility, rigor, rigour, severity, stiffness, unfeelingness |
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| | Antonyms: | | softness | | |
| | See Also: | | body, consistence, consistency, difficultness, difficulty, firmness, incompressibility, insensitiveness, insensitivity, sternness, strictness | |
| Webster's 1913 Dictionary |
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| | Definition: | | \Hard"ness\, n. [AS. heardness.]
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. (Min.) 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. (Chem.) 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.
Note: This quality is caused by the presence of calcium
carbonate, causing temporary hardness which can be
removed by boiling, or by calcium sulphate, causing
permanent hardness which can not be so removed, but may
be improved by the addition of sodium carbonate.
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| Biology Dictionary |
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- Total concentration of calcium and magnesium ions, expressed as the equivalent concentration (mg/L) of calcium carbonate. "Hard" water is water that contains lots of calcium carbonate and other minerals.
- In water, the total concentration of calcium and magnesium ions expressed as mg/l calcium carbonate.
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| Thesaurus Terms |
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| | Related Terms: | | abstruseness, arduousness, armor, asperity, astringency, austerity, bothersomeness, burdensomeness, callosity, callousness, callus, closeness, cohesiveness, coldbloodedness, coldheartedness, coldness, compactness, complexity, complication, congestedness, congestion, consistence, consistency, crabbedness, crampedness, crowdedness, cruelty, deepness, denseness, density, difficultness, difficulty, durability, esoterica, firmness, flintiness, formidable defenses, fundamentalism, gluiness, grimness, hairiness, hard heart, hard shell, hardenedness, hardheartedness, hardiness, hardness of heart, hardship, harshness, heart of stone, heartlessness, impenetrability, impenitence, impenitentness, impermeability, imperviousness, impliability, imporosity, inclemency, incompressibility, induration, inexorability, inexorableness, inflexibility, infrangibility, insensitiveness, insensitivity, insolence, intricacy, inuredness, irrepentance, jammedness, knottiness, laboriousness, lastingness, leatherlikeness, mercilessness, nonrepentance, obduracy, obdurateness, obstinacy, onerousness, oppressiveness, orthodoxy, Philistinism, pitilessness, precisianism, profoundness, profundity, purism, puritanism, reconditeness, relative density, relentlessness, remorselessness, resistance, rhinoceros hide, rigidity, rigidness, rigor, rigorousness, ropiness, roughness, ruggedness, ruthlessness, seared conscience, severity, short shrift, solidity, solidness, soundness, specific gravity, spissitude, stability, stamina, staunchness, sternness, stiffness, stoniness, stoutness, strength, strenuousness, stringency, stringiness, stubbornness, sturdiness, temper, tenacity, tender mercies, thick skin, thickness, toilsomeness, toughness, troublesomeness, unabjectness, unbendingness, unbreakability, unbreakableness, uncompassionateness, uncompromisingness, uncontriteness, unfeeling, unfeelingness, unforgivingness, ungentleness, unmercifulness, unnaturalness, unrelentingness, unremorsefulness, unresponsiveness, unsympatheticness, unyieldingness, vicissitude, vigor, viscidity, viscosity, viscousness, vitality |
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