Properties of acetylene
Thermophysical properties for acetylene (CAS: 74-86-2). Use the selector below to view properties in different unit systems.
Calculation Conditions
The following state-dependent properties were calculated at these standard conditions.
Temperature
25 °C
Pressure
1.01325 bar
Need properties at a different state? Use our interactive calculator.
Open CalculatorIdentification
- AtomsC: 2, H: 2
- CAS74-86-2
- FormulaC2H2
- ID74-86-2
- InChIC2H2/c1-2/h1-2H
- InChI KeyHSFWRNGVRCDJHI-UHFFFAOYSA-N
- IUPAC Nameethyne
- Molecular Weight (kg)26.0373
- Phaseg
- PubChem ID6326
- SMILESC#C
- Synonyms
Physical Properties
- Acentric factor0.178
- Critical pressure (bar)59.882
- Critical temperature (°C)35.15
- Critical volume (m³/kmol)0.11325
- Dipole moment0
- Melting temperature (°C)-80.75
- Normal boiling temperature (°C)-84.1496
State-dependent Properties
- API gravity181.121
- Compressibility factor1
- Density (kg/m³)1.06425
- Dynamic viscosity (cP)0.0103202
- Enthalpy of vaporization (mass) (kJ)260.285
- Enthalpy of vaporization (molar) (kJ/kmol)6777.11
- Gibbs free energy (kJ/kmol)0
- Joule–Thomson coefficient1.9230e-13
- Kinematic viscosity9.6972e-6
- Molar enthalpy (kJ/kmol)0
- Molar entropy (kJ/(kmol·K))0
- Molar heat capacity (kJ/(kmol·K))45.5409
- Molar volume (m³/kmol)24.4654
- Parachor1.0341e-5
- Poynting correction factor0.897188
- Prandtl number0.688227
- Saturation pressure (bar)47.7193
- Saturation temperature (°C)-84.9002
- Solubility parameter8639.69
- Specific enthalpy (kJ)0
- Specific entropy (kJ/kg·K)0
- Specific gravity0.898524
- Specific heat capacity (kJ/kg·K)1.74906
- Surface tension0.00103037
- Thermal conductivity0.0262279
- Thermal diffusivity1.4090e-5
Safety Properties
- Autoignition temperature (°C)305
- Flash point temperature (°C)-273.15
- Lower flammability limit0.023
- Upper flammability limit1
Environmental Properties
- Global warming potential
- Ozone depletion potential