Discussion
Which rate does the dew point fall at during dry ascent?
Answer: D
The mixing ratio is conserved during dry ascent but the pressure falls, so the vapour pressure falls and with it the dew point, at about 1.8 kelvin per kilometre. The temperature falls much faster, which is why the two curves converge and saturation is eventually reached. Their rate of convergence is what produces the 125 metre rule.
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