List of symbols
| Symbol | Name of the symbol | Unit |
|---|---|---|
| $H$ | geopotential altitude | $\mathrm{m}$ |
| $H_b$ | lower limit geopotential altitude | $\mathrm{m}$ |
| $H_p$ | pressure scale height | $\mathrm{m}$ |
| $M$ | air molar mass at sea level | $\mathrm{kg\cdot kmol^{-1}}$ |
| $N_A$ | Avogadro constant | $\mathrm{kmol^{-1}}$ |
| $R$ | specific gas constant | $\mathrm{J\cdot K^{-1}\cdot kg^{-1}}$ |
| $R^*$ | universal gas constant | $\mathrm{J\cdot K^{-1}\cdot kmol^{-1}}$ |
| $S$ | Sutherland's empirical coefficients $ S $ | $\mathrm{K}$ |
| $T$ | temperature $ T $ | $\mathrm{K}$ |
| $T_b$ | lower limit temperature | $\mathrm{K}$ |
| $a$ | speed of Sound | $\mathrm{m/s}$ |
| $g$ | gravitational acceleration | $\mathrm{m/s^2}$ |
| $h$ | height above sea level | $\mathrm{m}$ |
| $l$ | mean free path of air particles | $\mathrm{m}$ |
| $n$ | air number density | $\mathrm{m^{-3}}$ |
| $p_b$ | lower limit pressure | $\mathrm{Pa}$ |
| $p_{air}$ | atmospheric pressure air | $\mathrm{Pa}$ |
| $r$ | nominal earth's radius | $\mathrm{m}$ |
| $v̄$ | mean air-particle speed | $\mathrm{m/s}$ |
| $β$ | temperature gradient $ β $ | $\mathrm{K\cdot m^{-1}}$ |
| $β_s$ | Sutherland's empirical coefficients $ β_s $ | $\mathrm{kg\cdot m^{-1}\cdot s^{-1}\cdot K^{-1/2}}$ |
| $γ_{air}$ | specific weight air | $\mathrm{kg\cdot m^{-2}\cdot s^{-2}}$ |
| $κ$ | adiabatic index | $\mathrm{ }$ |
| $λ$ | thermal conductivity | $\mathrm{W\cdot m^{-1}\cdot K^{-1}}$ |
| $μ$ | dynamic viscosity | $\mathrm{kg\cdot m^{-1}\cdot s^{-1}}$ |
| $ν$ | kinematic viscosity | $\mathrm{m^2\cdot s^{-1}}$ |
| $ρ_{air}$ | density air | $\mathrm{kg/m^3}$ |
| $σ$ | effective collision diameter of an air molecule | $\mathrm{m}$ |
| $φ$ | latitude | $\mathrm{°}$ |
| $ω$ | air-particle collision frequency | $\mathrm{Hz}$ |