Discussion
Which mean lapse rate does the troposphere show?
Answer: A
The environmental lapse rate averages 6.5 kelvin per kilometre in the standard atmosphere, which lies between the dry adiabatic value of 9.8 and typical saturated values of 4 to 7. That placement makes the troposphere conditionally unstable, stable to dry ascent but unstable to saturated ascent. Confusing the environmental lapse rate with the dry adiabatic rate is the commonest error in this area. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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