Discussion
The Dry Adiabatic Lapse Rate is :
Answer: C
The dry adiabatic lapse rate is 9.8 K/km.
A rising parcel of unsaturated air expands and cools adiabatically. The rate is set by gravity and the specific heat of air at constant pressure:
\[ \begin{aligned} \Gamma_{d} &= \frac{g}{c_{p}} = \frac{9.81}{1004} \\ &\approx 9.8\ \mathrm{K/km} \end{aligned} \]
6.5 K/km is the average environmental lapse rate of the standard atmosphere. Around 5 to 6 K/km is typical of the saturated (moist) adiabatic lapse rate at low levels, which is smaller because condensation releases latent heat. 1.6 K/km is far too small.
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