The density, the volumetric mass density, of a substance is its mass per unit volume of the Earth’s atmosphere
Air density calculation: D = P/R*(T+273.15).
D: Density – (kg / m³)
P: Pressure, Atmospheric pressure: 101325 Pa
R: Specific gas constant , J/(kg*degK) = 287.05 for dry air
T: Temperature, deg C (°C)