- 1. Property of water that prevents lathering because of the presence of cations, mainly calcium and magnesium, which form insoluble soaps .2. The sum of calcium and magnesium ions expressed as the equivalent amount of calcium carbonate (CaCO3) .3. The property to form insoluble salts of fatty acid (soap) .
A Lexicon of Cave and Karst Terminology with Special Reference to Environmental Karst Hydrology. Courtesy of the author & The Karst Waters Institute. 2002.
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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 — Hardness. См. Твердость. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) … Словарь металлургических терминов
hardness — index brutality, congealment Burton s Legal Thesaurus. William C. Burton. 2006 … Law dictionary
hardness — (n.) O.E. heardnysse; see HARD (Cf. hard) + NESS (Cf. ness). Meaning difficulty of action or accomplishment is late 14c … Etymology dictionary
Hardness — A finishing term that implies the cloth has a hard, papery handle such as required with shirtings for China, North Africa and elsewhere. These fabrics are heavily filled and undergo heavy pressure when fairly dry; the face of the cloth may be… … Dictionary of the English textile terms
hardness — [härd′nis] n. 1. the state or quality of being hard (in various senses) 2. the relative capacity of a substance for scratching another or for being scratched or indented by another … English World dictionary
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
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 — (Roget s Thesaurus) < N PARAG:Hardness >N GRP: N 1 Sgm: N 1 hardness hardness &c. >Adj. Sgm: N 1 rigidity rigidity Sgm: N 1 renitence renitence renitency Sgm: N 1 inflexibility inflexibility temper callosity … English dictionary for students
hardness — a measure of the hardness of a metal or mineral. Hardness is a property easy to appreciate but difficult to quantify and measure. The Mohs hardness scale is used in geology to give a rough estimate of hardness by testing which minerals are… … Dictionary of units of measurement
hardness — The toughness of the surface of a metal. See brinell hardness indentation hardness rockwell hardness shore hardness … Dictionary of automotive terms