Discussion
Which value does the atmospheric scale height take approximately?
Answer: D
With a mean temperature near 250 kelvin the scale height \( RT/g \) works out at about 8 kilometres, so pressure falls by a factor of about 2.7 over that distance. The value depends on temperature and therefore varies with latitude and season. The boundary layer depth and tropopause height happen to be of comparable magnitude, which makes them plausible distractors. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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