Permanent hardness

(chem) hardness of water that cannot be removed by boiling as it results mainly from the presence of calcium and magnesium chlorides and sulphates


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    noun 1. . noun, Ophthalmology. 1. a plastic lens implanted surgically to replace the eye’s natural crystalline lens, usually because the natural lens has developed a cataract.

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    World-Wide Web A URL that always points to the same piece of web content. Web pages that appear for a limited time at their main URL, such as web logs or news sites, often display an alternative, permanent link. Readers can quote, bookmark, or link to this URL in order to refer to a particular […]

  • Permanently

    [pur-muh-nuh nt] /ˈpɜr mə nənt/ adjective 1. existing perpetually; everlasting, especially without significant change. 2. intended to exist or function for a long, indefinite period without regard to unforeseeable conditions: a permanent employee; the permanent headquarters of the United Nations. 3. long-lasting or nonfading: permanent pleating; permanent ink. noun 4. Also called permanent wave. a […]

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