Permanent hardness definition: hardness of water that cannot be removed by boiling as it results mainly from the presence of calcium and magnesium chlorides and sulphates. See examples of PERMANENT HARDNESS used in a sentence.
the hardness of ice. a relative degree or extent of this quality: wood of a desirable hardness. that quality in water that is imparted by the presence of dissolved salts, especially calcium sulfate or bicarbonate. unfeelingness or jadedness;callousness. ...
The meaning "difficult to do" is from c. 1200. Of water, in reference to the presence of mineral salts, 1650s; of consonants, 1775.Hard of hearingpreserves obsolete Middle English sense of "having difficulty in doing something." In the sense "strong, spiritous, fermented" from 1789 (as...
The meaning of TEMPORARY HARDNESS is the portion of the total hardness of water that is removable by boiling whereby the soluble bicarbonates of calcium and magnesium are converted into the corresponding insoluble carbonates and are precipitated —distin
The meaning of PERMANENT HARDNESS is the part of the total hardness of water that persists after boiling —distinguished from temporary hardness.
(a) in view of the broad meaning of the term "dealings of any kind" given in the Court of Final Appeal judgment in the case of Sin Kam-wah v HKSAR [2005]2 HKLRD 375, and having regard to the fact that CE was head of the Hong Kong Special Administrative Region (HKSAR) and its ...
the fact of being difficult to do, understand or answer The hardness of the questions varied a lot. the quality in facts of being definitely true and based on evidence that can be proved They want to be sure of the hardness of the data. the quality in water of containing cal...
If someone is successful in a test of either kind, you say that they pass it. I passed my driving test in Holland. Be Careful!To pass a test always means to succeed in it. It does not have the same meaning as take or do. If someone is unsuccessful in a test, you say that they...
Specifically, the various amounts of water in the tissues could induce changes in hardness measurement and the intensity of reflectance signals. Besides the water content, many other chemical components will affect the hyperspectral signals; therefore, the spectral information is not directly or ...
noun a quality of water that contains dissolved mineral salts that prevent soap from lathering “the costs of reducing hardness depend on the relative amounts of calcium and magnesium compounds that are present” see more Cite this entry Style: MLA "Hardness." Vocabulary.com Dictionary, Vocabular...