Thermodynamics

Air Density Simulator

Determine the density of moist air using equations from the ideal gas law, accounting for temperatures, absolute pressure, and humidity variations.

Gas Model

Ideal Mixture

Dry air + H2O

Mesh

21 nodes

-50°C to +50°C

Output

CSV

Export ready

Environment Preset

Temperature20.00 °C

-5050

Absolute Pressure1013 hPa

8001100

Relative Humidity50 %

0100

Animated temperature sweep

Mixture Density (ρ)

ρ = p_dry / (R_d * T) + p_vapor / (R_v * T)

Dry Air Constant (R_d)

287.058 J / (kg * K)

Water Vapor Constant (R_v)

461.495 J / (kg * K)

Saturation Pressure (p_sat)

6.1078 * 10^(7.5 * T_C / (T_C + 237.3)) hPa

Air becomes LESS dense when humidity increases because water molecules (18 g/mol) are lighter than diatomic nitrogen/oxygen molecules (~29 g/mol).

Temperature is converted to Kelvin: current T is 293.15 K.

Air Density (ρ)

1.1985kg/m³

Specific Volume

0.8344m³/kg

Vapor Pressure

11.69hPa

Saturation Pressure

23.38hPa