it is not "在比较潮湿的天气." Under normal condition, the water vapor

送交者: steven 于 2008-06-06, 03:47:03:

回答: 对, 压力变化了, 水蒸气就有变化由 JJZ 于 2008-06-05, 23:41:33:

is in equilibrium state, therefore, we don't see condensation. When the pressure drop suddenly due to breaking of the sound barrier, the equilibrium can no longer maintain, and hence we see condensation.

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