CO2 Carbon Dioxide Properties
Reference data and engineering information about co2 carbon dioxide properties for gases and compressed air applications.
CO2carbondioxidepropertiesData Table
Overview
Engineering reference data for CO2 Carbon Dioxide Properties in gases and compressed air.
Key Formulas
Ideal Gas Law
Pressure × Volume = moles × gas constant × temperature.
Boyle's Law
At constant temperature.
Charles's Law
At constant pressure.
Variables
| Symbol | Description | Unit |
|---|---|---|
| Pressure | Pa | |
| Volume | m³ | |
| Temperature | K | |
| Gas constant | 8.314 J/(mol·K) |
Carbon Dioxide Thermophysical Properties Data
18 rows
Property | Value | Unit | Value | Unit | Value | Unit | Value | Unit |
|---|---|---|---|---|---|---|---|---|
| Acidity (pKa1) | 6.35 | — | — | — | ||||
| Acidity (pKa2) | 10.33 | — | — | — | ||||
| Boiling Point - sublimation point | 194.686 | K | -78.464 | °C | -109.24 | °F | — | |
| Critical density | 10.63 | mol/dm3 | 467.6 | kg/m3 | 0.9073 | slug/ft3 | 29.19 | lb/ft3 |
| Critical pressure | 7.38 | MPa | 73.8 | bar | 72.8 | atm | 1070 | psi |
| Critical temperature | 304.13 | K | 30.98 | °C | 87.76 | °F | — | |
| Critical volume | 94.12 | cm3/mol | 0.00214 | m3/kg | 1.102 | ft3/slug | 0.03426 | ft3/lb |
| Density (at 25°C, 1 atm) | 40.8 | mol/m3 | 1.795 | kg/m3 | 0.00348 | slug/ft3 | 0.1121 | lb/ft3 |
| Density, gas at 0°C, 1 atm | 44.9 | mol/m3 | 1.977 | kg/m3 | 0.00384 | slug/ft3 | 0.1234 | lb/ft3 |
| Density, liquid at -37°C | 25017 | mol/m3 | 1101 | kg/m3 | 2.136 | slug/ft3 | 68.73 | lb/ft3 |
| Density, solid at -78.5°C | 35492 | mol/m3 | 1562 | kg/m3 | 3.031 | slug/ft3 | 97.51 | lb/ft3 |
| Flammable | No | — | — | — | ||||
| Gas constant - R | 188.92 | J/kg K | 0.0525 | Wh/(kg K) | 1130 | (ft lbf/slug °R) | 35.114 | (ft lbf/lb °R) |
| Molecular Weight | 44.0095 | g/mol | 0.09702 | lb/mol | — | — | ||
| Specific Gravity (relative to air) | 1.53 | — | — | — | ||||
| Specific Heat Ratio (Cp/Cv) | 1.29 | — | — | — | ||||
| Sound velocity in gas | 269 | m/s | — | — | — | |||
| Thermal Conductivity | 0.01663 | W/m°C | 0.009609 | Btu/hr ft °F | — | — |
Source: engineeringtoolbox.com
Phase Behavior and Key Definitions
Carbon dioxide is a gas at standard conditions (STP). Its phase diagram shows distinct behavior:
- Triple Point: The unique temperature and pressure where solid, liquid, and gas coexist. For CO₂: T = 216.58 K (-56.57 °C), P = 0.518 MPa (5.18 bar).
- Critical Point: The end point of the liquid-gas equilibrium curve. For CO₂: T = 304.13 K (30.98 °C), P = 7.38 MPa (73.8 bar). Above this point, CO₂ becomes a supercritical fluid.
- Sublimation Curve: The curve from the triple point to lower pressures/temperatures, showing the direct solid-gas transition.
- Dry Ice: The common name for solid carbon dioxide, which sublimes directly at -78.5°C (-109.3°F) at 1 atm.
Related Properties
Further detailed properties can be explored across varying temperature and pressure:
- Density and specific weight
- Dynamic and kinematic viscosity
- Prandtl number
- Specific heat capacity
- Thermal conductivity