- permanent hardness
- hardness of water not removed by boiling; it is usually due to sulfates and chlorides.
Medical dictionary. 2011.
permanent hardness
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permanent hardness — nekarbonatinis kietumas statusas T sritis chemija apibrėžtis Vandens kietumas, kurį sudaro vandenyje ištirpusios stiprių rūgščių Ca ir Mg druskos. atitikmenys: angl. non carbonate hardness; noncarbonate hardness; permanent hardness rus.… … Chemijos terminų aiškinamasis žodynas
permanent hardness — noun : the part of the total hardness of water that persists after boiling distinguished from temporary hardness … Useful english dictionary
permanent hardness — Noncarbonate hardness [16] … Lexicon of Cave and Karst Terminology
permanent hardness — /pɜmənənt ˈhadnəs/ (say permuhnuhnt hahdnuhs) noun hardness of water which is not destroyed by boiling …
permanent hardness — noun the presence in water of mineral salts (chiefly calcium sulphate) that are not removed by boiling … English new terms dictionary
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 — This article is about mechanical properties of materials. For other uses, see Hard. Hardness is the measure of how resistant solid matter is to various kinds of permanent shape change when a force is applied. Macroscopic hardness is generally… … Wikipedia
Permanent is sharp-P-complete — The correct title of this article is Permanent is #P complete. The substitution or omission of the # sign is because of technical restrictions. In a 1979 paper Leslie Valiant proved[1] that the problem of computing the permanent of a matrix is #P … Wikipedia
Carbonate hardness — is the measure of Calcium and Magnesium and other hard ions associated with carbonate (CO32 ) and bicarbonate (HCO3 ) ions contained in a solution, usually water. It is usually expressed either as parts per million (ppm or mg/L), or in degrees… … Wikipedia
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
