First what is HTHs? LOL

Please take a look at my air density formulae.

Air Density is a way of expressing the mass of air per unit of volume. Air density is an important value to consider in aerodynamics. The following steps will explain how to calculate dry air density:

Ad = p/(K*T)

Where:

Ad = Air density (kg/m^3)

p = Air pressure in Pascals (Pa)

K = Gas constant for dry air (287.05)

T = Temperature (Kelvin)

Here is an example :Use the ISA standard values for conditions at sea level. P = 101325 Pa and T = 15 deg C. The air density is calculated to be:

Ad = (101325) / (287.05 * (15 + 273.15)) = 1.2250 kg/m3

Density of Humid Air can be calculated as the sum of the densities of the two gases, dry air and water vapor, in proportion with their partial pressures. The moist air density formula:

HA= pd/K*T + pv/Kv*T

Where:

HA = Humid Air Density (kg/m^3)

pd = Partial pressure of dry air (Pa)

K = Gas constant dry air (287.05)

T = Temperature (Kelvin)

pv = Partial pressure of water vapor (Pa)

Kv = Gas constant for water vapor (461.495)

Your thoughts will be appreciated.