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hard water |
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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–eg, carbonates and sulfates, which may interfere with certain lab tests. See Mineral water, Spring water; Cf Soft water. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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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. Since 1997, NIST and other national metrology institutes have been working on the establishment of worldwide-unified Rockwell hardness scales (1). They both agreed that there was some correlation between the type A durometer and BS hardness scales. |
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