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词汇 temporary hardness
释义

Definition of temporary hardness in English:

temporary hardness

noun
mass noun

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

    （水的）暂时硬度

    Example sentencesExamples
    • There are two types of hardness, resulting from different compounds - permanent and temporary hardness.
    • Calcium bicarbonate is called temporary hardness because it will precipitate out of solution.
    • The term ‘temporary hardness’ is sometimes used, because the hardness is removed by boiling.
    • The water has a lot of temporary hardness from a high level of bicarbonate.
    • Temporary hardness can be precipitated and removed by boiling the water.
    • Make sure you know how and why temporary hardness is removed.
    • When temporary hardness is eliminated by this method, no salts remain.
    • The temporary hardness is caused by the magnesium and calcium bound in hydrogen carbonate or carbonate.
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