本题目来源于试卷: gc textbook chapter 13 temperature and kinetic theory，类别为 IB物理学
[问答题]
Why does exhaled air appear as a little white clivk; ) 8egg:rwmo(j5l:)ht*ubl 7owx oud in the winter (Fig. 13–28)?
参考答案: Exhaled air contains water vapor,
at a relatively high percentage. Since
the air inside the lungs is quite warm, the partial pressure of water in the
lungs can be high without saturating the air in the lungs, and condensation does
not occur. But in the cold winter air,
the air can hold very little water without condensation. Thus as the warm, water-laden exhaled air
cools, the partial pressure of water vapor exceeds the saturated vapor pressure
in the cold air, and some of the water will condense. The white cloud seen is due to the condensed
water vapor.
本题详细解析:
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