Gas density

The sources are:

Symbol
$\rho_{gas}$
Unit
kg/m$^3$
Formulae
$1.293393662-5.538444326{\cdot}{10}^{-3} \theta_{gas}+3.860201577{\cdot}{10}^{-5} {\theta_{gas}}^2-5.2536065{\cdot}{10}^{-7} {\theta_{gas}}^3$humid air @ 1 atm (Tsilingiris2007)
$360.77819{T_{gas}}^{-1.00336}$air @ 1 bar (Dumas&Trancossi2009)
$\frac{351.99}{T_{gas}}+\frac{344.84}{{T_{gas}}^2}$air @ 1 bar (UW/MHTL 8406, 1984)
$\frac{353p_{gas}}{T_{gas}}$air (ideal gas)
$\frac{337.4p_{gas}}{T_{gas}}$N2 (Vermeer1983)
$\frac{1666p_{gas}}{230+\theta_{gas}}$SF6 (Vermeer1983)
$\frac{538.9p_{gas}}{\theta_{gas}+\theta_{abs}}$CO2 (linear interpolation)
$\frac{\frac{1}{R_{gas}} p_{gas}}{T_{gas}}$ideal gas
$\frac{390.1p_{gas}}{\theta_{gas}+\theta_{abs}}$O2 (linear interpolation)
Related
$p_{gas}$
$R_{gas}$
$\theta_{abs}$
$\theta_{gas}$
Choices
GasFormula0°C15°C25°C50°C75°C100°C
Air78%N2+21%O2+minor1.2921.2251.1841.09341.01430.9462
N2N21.25011.18481.1451.05620.98020.9145
SF6SF66.61616.25636.03835.55545.14664.7949
CO2CO21.97631.87141.80751.66571.54481.4403
COCO1.25021.18491.1451.05620.98020.9144
O2O21.42871.3541.30851.2071.12011.0449
H2H20.08990.08520.08230.0760.07050.0658
NH3NH30.77130.72890.70330.64710.59950.5586
SO2SO22.93052.76332.66362.44592.26342.1073
HeHe0.17840.16920.16350.15090.140.1306
ArAr1.78351.69031.63351.50681.39831.3045
KrKr3.7483.55143.43143.16442.93612.7386
XeXe5.89655.5845.39374.97074.60994.2983
NeNe0.89960.85280.82420.76050.70590.6586