Oxygen - Thermophysical Properties

Thermophysical properties of Oxygen (O2) at 25°C (77°F, 298 K) and atmospheric pressure, including molecular weight, density, viscosity, specific heat, thermal conductivity, and phase transition properties.

PropertyValueUnits
Molecular Weight31.9988g/mol
Specific Gravity (air = 1)1.105dimensionless
Specific Volume12.24 / 0.764ft³/lb / m³/kg
Density of liquid at atmospheric pressure71.27 / 1142lb/ft³ / kg/m³
Absolute Viscosity13.4×10⁻⁶ / 0.020lbm/ft·s / cP
Sound velocity in gas329m/s
Specific Heat (cp)0.220 / 920Btu/lb·°F / J/kg·K
Specific Heat Ratio (cp/cv)1.40dimensionless
Gas constant (R)48.3 / 260ft·lb/lb·°R / J/kg·°C
Thermal Conductivity0.015 / 0.026Btu/hr·ft·°F / W/m·°C
Boiling Point (at 14.7 psia)-297.3 / -182.97°F / °C
Latent Heat of Evaporation91.7 / 213000Btu/lb / J/kg
Freezing/Melting Point (at 1 atm)-361.1 / -218.4°F / °C
Latent Heat of Fusion5.9 / 13700Btu/lb / J/kg
Critical Temperature-181.5 / -118.6°F / °C
Critical Pressure726 / 5.01psia / MN/m²
Critical Volume0.040 / 0.0025ft³/lb / m³/kg
FlammableNodimensionless