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Hard Water
(redirected from Hardness scales)

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hard water
Etymology: AS, heard + waeter
water that contains certain cations, particularly calcium and magnesium, that precipitate with soap solutions. The term is generally applied to tap water, and the degree of hardness varies with the source and previous treatment.
Hard Water
Water with a high content of calcium and magnesium salts—e.g., carbonates and sulphates—which may interfere with certain lab tests
hard water
Water with a high content of calcium and magnesium salts–eg, carbonates and sulfates, which may interfere with certain lab tests. See Mineral water, Spring water; Cf Soft water.
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On hardness scales, forged irons come up slightly softer than cast irons, and some super-sensitive players seem to be able to sense that, Gilbert said.
Metalcasting works fore golfers: in the world of golf club making, ... by Gibbs, Shea / Modern Casting
The Mohr or the Knoop hardness scales have been used to compare the hardness of various materials for both materials of construction of the mixer, as well as for the fillers that are being mixed.
Internal wear of the batch mixer--part 2 by Borzenki, Frank J. / Rubber World
Since 1997, NIST and other national metrology institutes have been working on the establishment of worldwide-unified Rockwell hardness scales (1).
Self-similarity simplification approaches for the modeling and ... by deWit, Roland / Journal of Research of the National Institute of Standards and Technology
 
 
 
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