Compound Information 

Name: 2,2-dimethylpropane
Formula: C5H12
Molar Mass: 72.151
Additional Names: neopentane
propane, 2,2-dimethyl-
Image of 2,2-dimethylpropane

Please be patient while the web interface loads...

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)
      3 experimental data points
    • Triple point temperature (Crystal 1, Liquid, and Gas)
      11 experimental data points
  • Normal boiling temperature (Liquid and Gas)
    • Critical temperature (Liquid and Gas)
      3 experimental data points
      • Critical pressure (Liquid and Gas)
        2 experimental data points
        • Boiling temperature (Liquid in equilibrium with Gas) as a function of Pressure
          Pressure from 35.6864 kPa to 3196 kPa
          • Phase boundary pressure
            • Phase boundary pressure (Liquid in equilibrium with Gas) as a function of Temperature
              Temperature from 256.601 K to 433.74 K
              50 experimental data points
            • Phase boundary pressure (Crystal 1 in equilibrium with Gas) as a function of Temperature
              Temperature from 196.597 K to 256.778 K
              33 experimental data points
            • Phase boundary pressure (Crystal 1 in equilibrium with Liquid) as a function of Temperature
              Temperature from 256.779 K to 295.294 K
              10 experimental data points
          • Critical density (Liquid and Gas)
            3 experimental data points
            • Density
              • Density (Liquid in equilibrium with Gas) as a function of Temperature
                Temperature from 256.601 K to 433.74 K
                50 experimental data points
              • Density (Gas) as a function of Temperature and Pressure
                Temperature from 256.601 K to 550 K
                Pressure from 0.2 kPa to 3196.3 kPa
                50 experimental data points
              • Density (Liquid) as a function of Temperature and Pressure
                Temperature from 256.601 K to 433.74 K
                Pressure from 0.2 kPa to 200000 kPa
                50 experimental data points
              • Density (Gas in equilibrium with Liquid) as a function of Temperature
                Temperature from 256.601 K to 433.74 K
                25 experimental data points
            • Isobaric coefficient of expansion
              • Isobaric coefficient of expansion (Liquid) as a function of Temperature and Pressure
                Temperature from 256.601 K to 433.74 K
                Pressure from 0.2 kPa to 200000 kPa
              • Isobaric coefficient of expansion (Gas) as a function of Temperature and Pressure
                Temperature from 256.601 K to 550 K
                Pressure from 0.2 kPa to 3196.3 kPa
            • Isothermal compressibility
              • Isothermal compressibility (Liquid) as a function of Temperature and Pressure
                Temperature from 256.601 K to 433.74 K
                Pressure from 0.2 kPa to 200000 kPa
                4 experimental data points
              • Isothermal compressibility (Gas) as a function of Temperature and Pressure
                Temperature from 256.601 K to 550 K
                Pressure from 0.2 kPa to 3196.3 kPa
            • Thermal pressure coefficient
              • Thermal pressure coefficient (Liquid) as a function of Temperature and Pressure
                Temperature from 256.601 K to 433.74 K
                Pressure from 0.2 kPa to 200000 kPa
              • Thermal pressure coefficient (Gas) as a function of Temperature and Pressure
                Temperature from 256.601 K to 550 K
                Pressure from 0.2 kPa to 3196.3 kPa
            • 2nd virial coefficient (Gas) as a function of Temperature
              Temperature from 256.601 K to 550 K
              49 experimental data points
              • 3rd virial coefficient (Gas) as a function of Temperature
                Temperature from 256.601 K to 550 K
                17 experimental data points
                • Enthalpy of phase transition
                  • Enthalpy of phase transition (Crystal 1 to Liquid in equilibrium with Gas)
                    4 experimental data points
                  • Enthalpy of phase transition (Crystal 2 to Crystal 1 in equilibrium with Gas)
                    3 experimental data points
                • Enthalpy of vaporization or sublimation
                  • Enthalpy of vaporization or sublimation (Liquid to Gas) as a function of Temperature
                    Temperature from 256.601 K to 433.74 K
                    10 experimental data points
                  • Enthalpy of vaporization or sublimation (Crystal 1 to Gas) as a function of Temperature
                    Temperature from 196.597 K to 256.778 K
                • Heat capacity at saturation pressure
                  • Heat capacity at saturation pressure (Crystal 2 in equilibrium with Gas) as a function of Temperature
                    Temperature from 7 K to 140.2 K
                    50 experimental data points
                  • Heat capacity at saturation pressure (Crystal 1 in equilibrium with Gas) as a function of Temperature
                    Temperature from 140.2 K to 256.778 K
                    50 experimental data points
                  • Heat capacity at saturation pressure (Liquid in equilibrium with Gas) as a function of Temperature
                    Temperature from 256.601 K to 433.6 K
                    3 experimental data points
                • Heat capacity at constant pressure
                  • Heat capacity at constant pressure (Liquid) as a function of Temperature and Pressure
                    Temperature from 256.601 K to 433.74 K
                    Pressure from 0.2 kPa to 200000 kPa
                    4 experimental data points
                  • Heat capacity at constant pressure (Ideal Gas) as a function of Temperature
                    Temperature from 200 K to 1500 K
                    48 experimental data points
                  • Heat capacity at constant pressure (Gas) as a function of Temperature and Pressure
                    Temperature from 256.601 K to 550 K
                    Pressure from 0.2 kPa to 3196.3 kPa
                    40 experimental data points
                • Enthalpy
                  • Enthalpy (Crystal 2 in equilibrium with Gas) as a function of Temperature
                    Temperature from 7 K to 140.2 K
                  • Enthalpy (Crystal 1 in equilibrium with Gas) as a function of Temperature
                    Temperature from 140.2 K to 256.778 K
                  • Enthalpy (Liquid in equilibrium with Gas) as a function of Temperature
                    Temperature from 256.779 K to 420 K
                  • Enthalpy (Ideal Gas) as a function of Temperature
                    Temperature from 200 K to 1500 K
                • Entropy
                  • Entropy (Liquid in equilibrium with Gas) as a function of Temperature
                    Temperature from 256.601 K to 433.74 K
                    1 experimental data points
                  • Entropy (Crystal 2 in equilibrium with Gas) as a function of Temperature
                    Temperature from 7 K to 140.2 K
                  • Entropy (Crystal 1 in equilibrium with Gas) as a function of Temperature
                    Temperature from 140.2 K to 256.778 K
                  • Entropy (Ideal Gas) as a function of Temperature and Pressure
                    Temperature from 200 K to 1500 K
                • Adiabatic compressibility
                  • Adiabatic compressibility (Liquid) as a function of Temperature and Pressure
                    Temperature from 256.601 K to 433.74 K
                    Pressure from 0.2 kPa to 200000 kPa
                  • Adiabatic compressibility (Gas) as a function of Temperature and Pressure
                    Temperature from 256.601 K to 550 K
                    Pressure from 0.2 kPa to 3196.3 kPa
                • Pressure coefficient of enthalpy (Liquid) as a function of Temperature and Pressure
                  Temperature from 256.601 K to 433.74 K
                  Pressure from 0.2 kPa to 200000 kPa
                  • Joule-Thomson coefficient (Gas) as a function of Temperature and Pressure
                    Temperature from 256.601 K to 550 K
                    Pressure from 0.2 kPa to 3196.3 kPa
                    • Speed of sound
                      • Speed of sound (Liquid) as a function of Temperature and Pressure
                        Temperature from 256.601 K to 433.74 K
                        Pressure from 0.2 kPa to 200000 kPa
                        50 experimental data points
                      • Speed of sound (Gas) as a function of Temperature and Pressure
                        Temperature from 256.601 K to 550 K
                        Pressure from 0.2 kPa to 3196.3 kPa
                        50 experimental data points
                      • Speed of sound (Liquid in equilibrium with Gas) as a function of Temperature
                        Temperature from 256.601 K to 433.74 K
                      • Speed of sound (Gas in equilibrium with Liquid) as a function of Temperature
                        Temperature from 256.601 K to 433.74 K
                    • Refractive index (Liquid in equilibrium with Gas) as a function of Wavelength and Temperature
                      Temperature from 258.013 K to 279.146 K
                      14 experimental data points
                      • Viscosity
                        • Viscosity (Gas) as a function of Temperature and Pressure
                          Temperature from 256.601 K to 550 K
                          Pressure from 0.2 kPa to 3196.3 kPa
                          31 experimental data points
                        • Viscosity (Liquid) as a function of Temperature and Pressure
                          Temperature from 256.601 K to 433.739 K
                          Pressure from 0.2 kPa to 200000 kPa
                          105 experimental data points
                        • Viscosity (Liquid in equilibrium with Gas) as a function of Temperature
                          Temperature from 256.601 K to 433.6 K
                          9 experimental data points
                      • Thermal conductivity
                        • Thermal conductivity (Gas) as a function of Temperature and Pressure
                          Temperature from 256.601 K to 550 K
                          Pressure from 0.2 kPa to 3196.3 kPa
                        • Thermal conductivity (Liquid in equilibrium with Gas) as a function of Temperature
                          Temperature from 256.601 K to 433.6 K
                        • Thermal conductivity (Liquid) as a function of Temperature and Pressure
                          Temperature from 256.601 K to 433.739 K
                          Pressure from 0.2 kPa to 200000 kPa
                      • Enthalpy of formation
                        • Enthalpy of formation (Gas)
                          3 experimental data points
                        • Enthalpy of formation (Liquid)
                          1 experimental data points

                      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

                      Compound Information
                      Property Availability
                      About this site
                      NIST Chemistry WebBook