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Acetylene - Thermophysical Properties

Chemical, Physical and Thermal Properties of Acetylene

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Acetylene is a colorless gas widely used as a fuel and a chemical building block. Acetylene is unstable in its purest form. Acetylene is odorless but commercial products normally have a marked odor.

Chemical, physical and thermal properties of Acetylene (Ethyne) - C2H2:

Molecular Weight 26.04
Specific Gravity 0.90
Specific Volume (ft3/lb, m3/kg) 14.9, 0.93
Density of liquid at atmospheric pressure (lb/ft3, kg/m3) 43.0, 693
Absolute Viscosity (lbm/ft s, centipoises) 6.72 10-6, 0.01
Sound velocity in gas (m/s) 343
Specific Heat - cp - (Btu/lboF or cal/goC, J/kgK) 0.40, 1674
Specific Heat Ratio - cp/cv 1.25
Gas constant - R - (ft lb/lboR, J/kgoC) 59.3, 319
Thermal Conductivity (Btu/hr ft oF, W/moC) 0.014, 0.024
Boiling Point - saturation pressure 14.7 psia and 760 mm Hg - (oF, oC) -103, -75
Latent Heat of Evaporation at boiling point (Btu/lb, J/kg) 264, 614000
Freezing or Melting Point  at 1 atm (oF, oC) -116, -82.2
Latent Heat of Fusion (Btu/lb, J/kg) 23, 53500
Critical Temperature (oF, oC) 97.1, 36.2
Critical Pressure (psia, MN/m2) 907, 6.25
Flammable yes
Heat of combustion (Btu/ft3, Btu/lb, kJ/kg) 1450, 21600, 50200
  • values at 25oC (77oF, 298 K) and atmospheric pressure

See also more about atmospheric pressure, and STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure,
as well as Thermophysical properties of: Acetone, Air, Ammonia, Argon, Benzene, Butane, Carbon dioxide, Carbon monoxide, Ethane, Ethanol, Ethylene, Helium, Hydrogen, Hydrogen sulfide, Methane, Methanol, Nitrogen, Oxygen, Pentane, Propane, Toluene, Water and Heavy water, D2O.

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  • en: acetylene ethyne c2h2
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