| hardness |
A characteristic of water determined by the levels of calcium and magnesium.
출처: www.mwdh2o.com/mwdh2o/pages/yourwater/glossary/glo...
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| hardness |
The measure of a stone
출처: www.zulumoon.com/glossary/H-glossary.htm
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| hardness |
The resistance to surface indentation usually measured by the depth of penetration (or arbitrary units related to the depth of penetration) of a blunt point under a given load using a particular instrument according to a prescribed procedure.
출처: www.fibreglast.com/contentpages-glossary+of+terms+...
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| hardness |
The hardness of water is equal to the concentration of dissolved calcium and magnesium ions. Usually expressed as ppm of (CaCO 3 ).
출처: www.howtobrew.com/glossary.html
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| hardness |
The ability of water to neutralize soap, due to the presence of cations such as calcium and magnesium; usually expressed as parts per million equivalents of calcium carbonate. Refers to the calcium and magnesium ion concentration in water on a scale of very soft (0-20 ppm as CaCO 3 ), soft (20-50 ppm), hard (50-500 ppm) and very hard (55+ ppm).
출처: ag.ansc.purdue.edu/courses/aq448/glossary.htm
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