Dry adiabat ($T/T_0=(p/p_0{)}^{R_a/c_p}$)

For an ideal gas of constant specific heat, an isentrope without phase changes satisfies $T=T_0(p/p_0{)}^{R_a/c_p}$. A dilute saturated atmosphere approximates this path only when both vapour sensible heat and latent-heating corrections are small.