| hardness number |
The number used to designate the hardness of metal. The number is related to the scale of values of a particular hardness test, as Rockwell B 80 or Brinell 150.
출처: www.technicalmaterials.com/about/glossary.html
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| hardness |
The resistance of a substance to surface abrasion.
출처: www.havoline.com/carcare/glossary/h.html
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| hardness |
The amount of calcium or magnesium dissolved in the water. High levels contribute to scale deposits.
출처: www.poolandspa.com/page369.htm
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| hardness |
The resistance of a mineral to scratching.
출처: volcano.und.nodak.edu/vwdocs/glossary.html
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| hardness |
The texture of water that contains high levels of harmless metals such as magnesium and calcium. The term called "hard water" is used because it's "hard" to get lather from soap and shampoo when using this water.
출처: www.lvwater.org/water_words.asp
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