Compound Information 

Name: 2-butyne
Formula: C4H6
Molar Mass: 54.092
Additional Names: dimethylacetylene
Image of 2-butyne
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Property Availability 

For this compound, WTT contains critically evaluated recommendations for:
(Please note that if more than 50 points are used for regression, only the 50 most-constraining points are reported)

  • Triple point temperature
    • Triple point temperature (Crystal 2, Crystal 1, and Gas)
      1 experimental data points
    • Triple point temperature (Crystal 1, Liquid, and Gas)
      6 experimental data points
  • Normal boiling temperature (Liquid and Gas)
    • Critical temperature (Liquid and Gas)
      • Critical pressure (Liquid and Gas)
        • Boiling temperature (Liquid in equilibrium with Gas) as a function of Pressure
          Pressure from 6.17229 kPa to 4976.24 kPa
          • Phase boundary pressure
            • Phase boundary pressure (Liquid in equilibrium with Gas) as a function of Temperature
              Temperature from 240.956 K to 489.1 K
              26 experimental data points
            • Phase boundary pressure (Crystal 1 in equilibrium with Liquid) as a function of Temperature
              Temperature from 240.956 K to 267.32 K
              10 experimental data points
          • Critical density (Liquid and Gas)
            • Density
              • Density (Liquid in equilibrium with Gas) as a function of Temperature
                Temperature from 240.956 K to 489.1 K
                15 experimental data points
              • Density (Liquid) as a function of Temperature and Pressure
                Temperature from 247.59 K to 293.19 K
                Pressure from 0.1 kPa to 103810 kPa
                50 experimental data points
              • Density (Gas) as a function of Temperature and Pressure
                Temperature from 240 K to 457 K
                Pressure from 0.001 kPa to 1056.54 kPa
              • Density (Gas in equilibrium with Liquid) as a function of Temperature
                Temperature from 392.77 K to 489.1 K
            • Enthalpy of phase transition
              • Enthalpy of phase transition (Crystal 2 to Crystal 1 in equilibrium with Gas)
                1 experimental data points
              • Enthalpy of phase transition (Crystal 1 to Liquid in equilibrium with Gas)
                1 experimental data points
            • Enthalpy of vaporization or sublimation (Liquid to Gas) as a function of Temperature
              Temperature from 240.956 K to 489.1 K
              1 experimental data points
              • Heat capacity at saturation pressure
                • Heat capacity at saturation pressure (Liquid in equilibrium with Gas) as a function of Temperature
                  Temperature from 240.956 K to 479.318 K
                  20 experimental data points
                • Heat capacity at saturation pressure (Crystal 2 in equilibrium with Gas) as a function of Temperature
                  Temperature from 0.0002 K to 153.817 K
                  50 experimental data points
                • Heat capacity at saturation pressure (Crystal 1 in equilibrium with Gas) as a function of Temperature
                  Temperature from 153.818 K to 240.955 K
                  24 experimental data points
              • Heat capacity at constant pressure (Ideal Gas) as a function of Temperature
                Temperature from 50 K to 3000 K
                • Enthalpy
                  • Enthalpy (Crystal 2 in equilibrium with Gas) as a function of Temperature
                    Temperature from 0.0002 K to 153.817 K
                  • Enthalpy (Crystal 1 in equilibrium with Gas) as a function of Temperature
                    Temperature from 153.818 K to 240.955 K
                  • Enthalpy (Liquid in equilibrium with Gas) as a function of Temperature
                    Temperature from 240.956 K to 479.318 K
                  • Enthalpy (Ideal Gas) as a function of Temperature
                    Temperature from 50 K to 3000 K
                • Entropy
                  • Entropy (Crystal 2 in equilibrium with Gas) as a function of Temperature
                    Temperature from 0.0002 K to 153.817 K
                  • Entropy (Crystal 1 in equilibrium with Gas) as a function of Temperature
                    Temperature from 153.818 K to 240.955 K
                  • Entropy (Liquid in equilibrium with Gas) as a function of Temperature
                    Temperature from 240.956 K to 479.318 K
                    1 experimental data points
                  • Entropy (Ideal Gas) as a function of Temperature and Pressure
                    Temperature from 50 K to 3000 K
                • Refractive index (Liquid in equilibrium with Gas) as a function of Wavelength and Temperature
                  Temperature from 293.138 K to 298.136 K
                  5 experimental data points
                  • Viscosity
                    • Viscosity (Gas) as a function of Temperature and Pressure
                      Temperature from 310 K to 730 K
                    • Viscosity (Liquid in equilibrium with Gas) as a function of Temperature
                      Temperature from 250 K to 480 K
                  • Thermal conductivity
                    • Thermal conductivity (Gas) as a function of Temperature and Pressure
                      Temperature from 310 K to 730 K
                    • Thermal conductivity (Liquid in equilibrium with Gas) as a function of Temperature
                      Temperature from 250 K to 440 K
                  • Enthalpy of formation
                    • Enthalpy of formation (Gas)
                      1 experimental data points
                    • 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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