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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 tensile and elongation data were collected using a United model E-VI-60 six-station tensile test instrument, while the hardness data were collected using a Zwick hardness tester. A new line of hardness testers in digital or analog formats reportedly provides uniform force application and a smoother overall test process. Hardness of films was evaluated using a BYK-Gardner pendulum hardness tester 24 hr after the films were cured onto aluminum substrates. |
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