Values are given for gas phase at 25 o C /77 o F / 298 K and 1 bara, if not other phase, temperature or pressure given.
For full table with Imperial Units - rotate the screen!
Property | Value | Unit | Value | Unit | Value | Unit | Value | Unit | |||
Autoignition temperature | 505 | K | 232 | °C | 450 | °F | |||||
Boiling Point | 213.6 | K | -59.55 | °C | -75.2 | °F | |||||
Critical density | 10.2 | mol/dm 3 | 348 | kg/m 3 | 0.675 | slug/ft3 | 21.7 | lb/ft3 | |||
Critical pressure | 8.97 | MPa=MN/m 2 | 89.7 | bar | 88.5 | atm | 1301 | psi=lb f /in 2 | |||
Critical temperature | 373.3 | K | 100.2 | °C | 212.3 | °F | |||||
Critical volume | 98 | cm 3 /mol | 0.00288 | m 3 /kg | 1.48 | ft 3 /slug | 0.0461 | ft 3 /lb | |||
Density (gas) | 44.16 | mol/m 3 | 1.505 | kg/m 3 | 0.00292 | slug/ft 3 | 0.0940 | lb/ft 3 | |||
Density (liquid) at -121.9 °F/-85.5°C | 29116 | mol/m 3 | 992.3 | kg/m 3 | 1.925 | slug/ft 3 | 61.95 | lb/ft 3 | |||
Density (liquid) at -76 °F/-60°C | 26877 | mol/m 3 | 916.0 | kg/m 3 | 1.777 | slug/ft 3 | 57.18 | lb/ft 3 | |||
Flammable, gas and liquid | yes | ||||||||||
Flash point | 480 | K | 207 | °C | 405 | °F | |||||
Gas constant , individual - R | 244.0 | J/kg K | 0.06777 | Wh/(kg K) | 1459 | [ft lb f /slug °R] | 45.34 | [ft lb f /lb °R] | |||
Gibbs free energy of formation (gas) | -34 | kJ/mol | -998 | kJ/kg | -429 | Btu/lb | |||||
Heat (enthalpy) of formation (gas) | -20.6 | kJ/mol | -604 | kJ/kg | -260 | Btu/lb | |||||
Heat (enthalpy) of sublimation,at -145°F/-98°C | 25.4 | kJ/mol | 745 | kJ/kg | 320 | Btu/lb | |||||
Heat (enthalpy) of evaporation at-100°F/-73°C | 20.00 | kJ/mol | 353.4 | kJ/kg | 151.93 | Btu/lb | |||||
Heat capacity , Cp (gas) | 34.6 | J/mol K | 1.01 | kJ/kg K | 0.242 | Btu/lb°F or cal/g K | |||||
Specific heat capacity, Cp (liquid) at 20 bara | 76.5 | J/mol K | 2.24 | kJ/kg K | 0.536 | Btu/lb°F or cal/g K | |||||
Specific heat capacity, Cv (gas) | 26.0 | J/mol K | 0.76 | kJ/kg K | 0.182 | Btu/lb°F or cal/g K | |||||
Specific heat capacity, Cv (liquid) at 20 bara | 37.0 | J/mol K | 1.09 | kJ/kg K | 0.259 | Btu/lb°F or cal/g K | |||||
Ionization potential | 10.46 | eV | |||||||||
Melting point | 187.66 | K | -85.5 | °C | -121.9 | °F | |||||
Molecular Weight | 34.081 | g/mol | 0.07514 | lb/mol | |||||||
Solubility in water, at 25°C | 4 | mg/ml | |||||||||
Sound velocity in gas | 309 | m/s | 1014 | ft/s | 692 | mi/h | |||||
Sound velocity in liquid at 20 bara | 836 | m/s | 2742 | ft/s | 1873 | mi/h | |||||
Specific Gravity (gas) (relativ to air) | 1.19 | ||||||||||
Specific Gravity (liquid) (relativ to water) | 0.92 | ||||||||||
Specific Heat Ratio (gas) - CP/CV | 1.33 | ||||||||||
Specific Heat Ratio (liquid) - CP/CV at 20 bara | 2.07 | ||||||||||
Specific Volume (gas) | 0.023 | m 3 /mol | 0.66 | m 3 /kg | 342.44 | ft 3 /slug | 10.64 | ft 3 /lb | |||
Specific Volume (liquid) at -121.9 °F/-85.5°C | 0.0000343 | m 3 /mol | 0.00101 | m 3 /kg | 0.519 | ft 3 /slug | 0.0161 | ft 3 /lb | |||
Standard molar entropy , S° (gas) | 206 | J/mol K | 6.04 | kJ/kg K | 1.44 | Btu/lb °F | |||||
Surface tension at 257°F/125°C | 58.1 | dynes/cm | 0.0581 | N/m | |||||||
Thermal Conductivity | 0.018 | W/m °C | 0.010400 | Btu/hr ft °F | |||||||
Triple point pressure | 0.0233 | MPa=MN/m 2 | 0.233 | bar | 0.230 | atm | 3.38 | psi=lb f /in 2 | |||
Triple point temperature | 187.63 | K | -85.5 | °C | -121.94 | °F | |||||
Vapor (saturation) pressure | 2.0262 | MPa=MN/m 2 | 15200.0 | mm Hg | 19.9971 | atm | 293.88 | psi=lb f /in 2 | |||
Viscosity , dynamic (absolute) | 0.013 | cP | 8.6 | [lb m /ft s*10 -6 ] | 0.27 | [lb f s/ft 2 *10 -6 ] | |||||
Viscosity, kinematic | 8.505 | cSt | 91.5 | [ft 2 /s*10 -6 ] |
See more about atmospheric pressure , and STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure ,
as well as Thermophysical properties of: Acetone , Acetylene , Air , Ammonia , Argon , Benzene , Butane , Carbon dioxide , Carbon monoxide , Ethane , Ethanol , Ethylene , Helium , Hydrogen , Methane , Methanol , Nitrogen , Oxygen , Pentane , Propane , Toluene , Water and Heavy water, D 2 O .
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