Gas

Specific heat $c_{\text{p}}$

(kJ/kg K)

Lapse rate $\Gamma$

(K/km)

Molecular mass m

(kg)

Air (dry)

1.006

−9.75

Air (standard)

1.51

−6.49

4.82 × 10⁻²⁶

CO₂

0.844

−11.6

7.30 × 10⁻²⁶