Ssing 發問於 科學及數學化學 · 5 年 前

Urgent!!Breathed air

Breathed air contains more oxygen than carbon dioxide.

True or False??

Thanks a lot!

3 個解答

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  • 土扁
    Lv 7
    5 年 前
    最佳解答

    "Breathed air contains more oxygen than carbondioxide."

    The above statement is true.

    It is a misconception that the breathed air contains a lot of carbondioxide. Actually, only a smallproportion of oxygen undergoes gas exchange to give carbon dioxide. Averagelyspeaking, breathed air contains 78% of nitrogen, 16% of oxygen, 4% of carbondioxide, saturated water vapour, and a small amount of other gases.

    (Averagely speaking, unbreathed ari contains 78% of nitrogen, 21% of oxygen,0.04% of carbon dioxide, a variable amount of water vapour, and a small amountof other gases.)

    資料來源: textbook
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  • 5 年 前

    Breathed air contains more oxygen than carbon dioxide.

    It is false!

    This is the correct answer:

    Breathed air contains less oxygen and more carbon dioxide than unbreathed air.

    Addition:

    The temperature of breathed is higher than that of unbreathed air.

    Breathed air contain more water vapour than unbreathed air.

    資料來源: me
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  • 5 年 前

    據講氧氣佔兩成,二氧化碳只有0.04%。

    2015-03-08 19:22:57 補充:

    你係指exhausted air 嗎?

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