Compound Information 

Name: ethyne
Formula: C2H2
Molar Mass: 26.038
Additional Names: narcylen
ethine
vinylene
acetylene
Image of ethyne

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Property Availability 

For this compound, WTT contains critically evaluated recommendations for:

  • Triple point temperature
    • Triple point temperature (Crystal 1, Liquid, and Gas)
      5 experimental data points
    • Triple point temperature (Crystal 2, Crystal 1, and Gas)
      1 experimental data points
  • Critical temperature (Liquid and Gas)
    9 experimental data points
    • Critical pressure (Liquid and Gas)
      5 experimental data points
      • Boiling temperature (Liquid in equilibrium with Gas) as a function of Pressure
        Pressure from 121.209 kPa to 6206.31 kPa
        • Phase boundary pressure
          • Phase boundary pressure (Crystal 1 in equilibrium with Gas) as a function of Temperature
            Temperature from 133 K to 191.66 K
            25 experimental data points
          • Phase boundary pressure (Liquid in equilibrium with Gas) as a function of Temperature
            Temperature from 191.66 K to 308.39 K
            39 experimental data points
        • Critical density (Liquid and Gas)
          3 experimental data points
          • Density
            • Density (Gas in equilibrium with Liquid) as a function of Temperature
              Temperature from 240.586 K to 308.394 K
              4 experimental data points
            • Density (Liquid in equilibrium with Gas) as a function of Temperature
              Temperature from 191.66 K to 308.39 K
              29 experimental data points
            • Density (Gas) as a function of Temperature and Pressure
              Temperature from 113.78 K to 302.003 K
              Pressure from 0.0008 kPa to 837.59 kPa
              30 experimental data points
          • Enthalpy of phase transition (Crystal 1 to Liquid in equilibrium with Gas)
            2 experimental data points
            • Enthalpy of vaporization or sublimation
              • Enthalpy of vaporization or sublimation (Liquid to Gas) as a function of Temperature
                Temperature from 191.66 K to 308.39 K
              • Enthalpy of vaporization or sublimation (Crystal 1 to Gas) as a function of Temperature
                Temperature from 133 K to 191.66 K
            • Heat capacity at saturation pressure (Liquid in equilibrium with Gas) as a function of Temperature
              Temperature from 191.66 K to 300 K
              • Heat capacity at constant pressure (Ideal Gas) as a function of Temperature
                Temperature from 50 K to 3000 K
                • Enthalpy
                  • Enthalpy (Liquid in equilibrium with Gas) as a function of Temperature
                    Temperature from 191.66 K to 300 K
                  • Enthalpy (Ideal Gas) as a function of Temperature
                    Temperature from 50 K to 3000 K
                • Entropy
                  • Entropy (Ideal Gas) as a function of Temperature and Pressure
                    Temperature from 50 K to 3000 K
                  • Entropy (Liquid in equilibrium with Gas) as a function of Temperature
                    Temperature from 191.66 K to 300 K
                • Surface tension (Liquid in equilibrium with Gas) as a function of Temperature
                  Temperature from 195.045 K to 210.045 K
                  15 experimental data points
                  • Viscosity
                    • Viscosity (Gas) as a function of Temperature and Pressure
                      Temperature from 190 K to 473.153 K
                      24 experimental data points
                    • Viscosity (Liquid in equilibrium with Gas) as a function of Temperature
                      Temperature from 200 K to 300 K
                  • Thermal conductivity
                    • Thermal conductivity (Gas) as a function of Temperature and Pressure
                      Temperature from 190 K to 460 K
                    • Thermal conductivity (Liquid in equilibrium with Gas) as a function of Temperature
                      Temperature from 200 K to 270 K
                  • Enthalpy of formation
                    • Enthalpy of formation (Gas)
                    • Enthalpy of formation (Liquid)

                  About WTT 

                  NIST/TRC Web Thermo Tables (WTT)
                  NIST Standard Reference Subscription Database 3 - Professional Edition
                  Version 2-2012-1-Pro

                  This web application provides access to a collection of critically evaluated thermodynamic property data for pure compounds with a primary focus on organics. These data were generated through dynamic data analysis, as implemented in the NIST ThermoData Engine software package [1, 2, 3, 4, 5, 6]. Some critically evaluated data from the historical TRC Thermodynamic Tables archive [7, 8] are included, also. As of May 2012, the Professional Edition contains information on 28432 compounds and total of 531486 evaluated data points. The properties covered by both versions (32 total) are described in Properties and Implemented Models.

                  Developed by Kenneth Kroenlein, Chris D. Muzny, Andrei F. Kazakov, Vladimir Diky, Robert D. Chirico, Joseph W. Magee, Ilmutdin Abdulagatov and Michael Frenkel.

                  Thermodynamics Research Center (TRC)
                  Thermophysical Properties Division
                  National Institute of Standards and Technology
                  Boulder CO 80305-3337

                  Questions and comments should be addressed to Dr. Michael Frenkel .

                  DISCLAIMER: The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high-quality copy of the database and to verify that the methods and data contained therein have been selected on the basis of sound scientific judgement. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the program and database.

                  Distributed by:
                  Standard Reference Data Program
                  National Institute of Standards and Technology
                  Gaithersburg MD 20899

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