Discussion
Which effect does cold air have on the height of a pressure surface?
Answer: A
Cold air has a smaller scale height, so the pressure falls more rapidly with height and a given pressure surface is reached at a lower altitude. This is why upper level troughs correspond to cold air and ridges to warm air. The relationship between the thermal and the height field is the whole content of the thickness concept. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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