4) CO2 has a molecular weight
of 12 + O2
= 44 so it 50 % heavier than
air but that is not enough to cause it separate out, particularly in the turbulent
conditions of the troposphere.
Therefore, changes in density N
of total
air are governed by hydrostatic equilibrium
condition dp / dz
= - ρ g
= - NM g. Using the hydrostatic equilibrium and the ideal gas law you can easily express the reference term γ ∂ N / ∂ z via g and temperature.