hardness salts

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• Hardness — Hard ness, n. [AS. heardness.] 1. The quality or state of being hard, literally or figuratively. [1913 Webster] The habit of authority also had given his manners some peremptory hardness. Sir W. Scott. [1913 Webster] 2. (Min.) The cohesion of the …   The Collaborative International Dictionary of English

• hardness — /hahrd nis/, n. 1. the state or quality of being hard: the hardness of ice. 2. a relative degree or extent of this quality: wood of a desirable hardness. 3. that quality in water that is imparted by the presence of dissolved salts, esp. calcium… …   Universalium

• hardness — 1. The degree of firmness of a solid, as determined by its resistance to deformation, scratching, or abrasion. SEE ALSO: h. scale, number. 2. The relative penetrating power of a beam of x rays, used both within the diagnostic range of …   Medical dictionary

• hardness — noun 1. the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale • Ant: ↑softness • Derivationally related forms: ↑hard • Hypernyms: ↑consistency, ↑consistence, ↑eubstance, ↑ …   Useful english dictionary

• hardness — hard ► ADJECTIVE 1) solid, firm, and rigid; not easily broken, bent, or pierced. 2) requiring or demonstrating a great deal of endurance or effort; difficult. 3) (of a person) not showing any signs of weakness; tough. 4) (of information or a… …   English terms dictionary

• hardness —    1. Property of water that prevents lathering because of the presence of cations, mainly calcium and magnesium, which form insoluble soaps [10].    2. The sum of calcium and magnesium ions expressed as the equivalent amount of calcium carbonate …   Lexicon of Cave and Karst Terminology

• hardness — hard•ness [[t]ˈhɑrd nɪs[/t]] n. 1) the state or quality of being hard 2) chem. that quality in water that is imparted by the presence of dissolved salts, esp. calcium sulfate or bicarbonate 3) mir the comparative ability of a substance to scratch …   From formal English to slang

• hardness — /ˈhadnəs/ (say hahdnuhs) noun 1. the state or quality of being hard. 2. an instance of this quality. 3. that quality in impure water which is imparted by the presence of dissolved salts, especially calcium sulphate. 4. Mineralogy the comparative… …  

• temporary hardness — noun : the portion of the total hardness of water that is removable by boiling whereby the soluble bicarbonates of calcium and magnesium are converted into the corresponding insoluble carbonates and are precipitated distinguished from permanent… …   Useful english dictionary

• total hardness — a measure of the total amount of magnesium and calcium salts dissolved in water including carbonates and non carbonates …   Dictionary of ichthyology

• permanent hardness — noun the presence in water of mineral salts (chiefly calcium sulphate) that are not removed by boiling …   English new terms dictionary