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  1. Oxford American Dictionary

    hardness

    • IPA[ˈhärdnəs]

    美式

    • n.
      the quality or condition of being hard

    • noun: hardness, plural noun: hardnesses

    • 釋義
    • 相關詞

    名詞

    permanent hardness

    • n.
      the presence in water of mineral salts (chiefly calcium sulphate) that are not removed by boiling.

    Oxford Dictionary

    temporary hardness

    • n.
      the presence in water of mineral salts (chiefly calcium bicarbonate) that are removed by boiling.

    Oxford Dictionary

    Brinell hardness test

    • n.
      a test to determine the hardness of metals and alloys by hydraulically pressing a steel ball ...

    Oxford American Dictionary

    • 更多解釋

    hardness

    • IPA[ˈhɑːdnəs]

    英式

    • n.
      the quality or condition of being hard: people complained about the hardness of the chairs a lack of mental hardness

    Oxford Dictionary