Compound Information 

Name: hydrogen
Formula: H2
Molar Mass: 2.016
Image of hydrogen

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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 (Crystal 1, Liquid, and Gas)
    3 experimental data points
    • Normal boiling temperature (Liquid and Gas)
      • Critical temperature (Liquid and Gas)
        3 experimental data points
        • Critical pressure (Liquid and Gas)
          3 experimental data points
          • Boiling temperature (Liquid in equilibrium with Gas) as a function of Pressure
            Pressure from 7.35783 kPa to 1296.4 kPa
            • Phase boundary pressure
              • Phase boundary pressure (Liquid in equilibrium with Gas) as a function of Temperature
                Temperature from 13.957 K to 33.14 K
                50 experimental data points
              • Phase boundary pressure (Crystal 1 in equilibrium with Gas) as a function of Temperature
                Temperature from 4.5 K to 13.95 K
                12 experimental data points
              • Phase boundary pressure (Crystal 1 in equilibrium with Liquid) as a function of Temperature
                Temperature from 13.95 K to 80 K
                31 experimental data points
            • Critical density (Liquid and Gas)
              2 experimental data points
              • Density
                • Density (Gas in equilibrium with Liquid) as a function of Temperature
                  Temperature from 13.957 K to 33.145 K
                  2 experimental data points
                • Density (Liquid in equilibrium with Gas) as a function of Temperature
                  Temperature from 13.957 K to 33.14 K
                  50 experimental data points
                • Density (Liquid) as a function of Temperature and Pressure
                  Temperature from 13.957 K to 33.14 K
                  Pressure from 2 kPa to 2000000 kPa
                  50 experimental data points
                • Density (Gas) as a function of Temperature and Pressure
                  Temperature from 13.957 K to 1000 K
                  Pressure from 2 kPa to 1296.4 kPa
                  50 experimental data points
              • Isobaric coefficient of expansion
                • Isobaric coefficient of expansion (Liquid) as a function of Temperature and Pressure
                  Temperature from 13.957 K to 33.14 K
                  Pressure from 2 kPa to 2000000 kPa
                • Isobaric coefficient of expansion (Gas) as a function of Temperature and Pressure
                  Temperature from 13.957 K to 1000 K
                  Pressure from 2 kPa to 1296.4 kPa
              • Isothermal compressibility
                • Isothermal compressibility (Liquid) as a function of Temperature and Pressure
                  Temperature from 13.957 K to 33.14 K
                  Pressure from 2 kPa to 2000000 kPa
                • Isothermal compressibility (Gas) as a function of Temperature and Pressure
                  Temperature from 13.957 K to 1000 K
                  Pressure from 2 kPa to 1296.4 kPa
              • Thermal pressure coefficient
                • Thermal pressure coefficient (Liquid) as a function of Temperature and Pressure
                  Temperature from 13.957 K to 33.14 K
                  Pressure from 2 kPa to 2000000 kPa
                • Thermal pressure coefficient (Gas) as a function of Temperature and Pressure
                  Temperature from 13.957 K to 1000 K
                  Pressure from 2 kPa to 1296.4 kPa
              • 2nd virial coefficient (Gas) as a function of Temperature
                Temperature from 13.957 K to 1000 K
                50 experimental data points
                • 3rd virial coefficient (Gas) as a function of Temperature
                  Temperature from 13.957 K to 1000 K
                  19 experimental data points
                  • Enthalpy of vaporization or sublimation
                    • Enthalpy of vaporization or sublimation (Liquid to Gas) as a function of Temperature
                      Temperature from 13.957 K to 33.14 K
                    • Enthalpy of vaporization or sublimation (Crystal 1 to Gas) as a function of Temperature
                      Temperature from 10 K to 13.95 K
                  • Heat capacity at saturation pressure (Liquid in equilibrium with Gas) as a function of Temperature
                    Temperature from 13.957 K to 33 K
                    • Heat capacity at constant pressure
                      • Heat capacity at constant pressure (Ideal Gas) as a function of Temperature
                        Temperature from 50 K to 5000 K
                      • Heat capacity at constant pressure (Liquid) as a function of Temperature and Pressure
                        Temperature from 13.957 K to 33.14 K
                        Pressure from 2 kPa to 2000000 kPa
                      • Heat capacity at constant pressure (Gas) as a function of Temperature and Pressure
                        Temperature from 13.957 K to 1000 K
                        Pressure from 2 kPa to 1296.4 kPa
                    • Enthalpy (Ideal Gas) as a function of Temperature
                      Temperature from 50 K to 5000 K
                      • Entropy (Ideal Gas) as a function of Temperature and Pressure
                        Temperature from 50 K to 5000 K
                        • Adiabatic compressibility
                          • Adiabatic compressibility (Liquid) as a function of Temperature and Pressure
                            Temperature from 13.957 K to 33.14 K
                            Pressure from 2 kPa to 2000000 kPa
                          • Adiabatic compressibility (Gas) as a function of Temperature and Pressure
                            Temperature from 13.957 K to 1000 K
                            Pressure from 2 kPa to 1296.4 kPa
                        • Pressure coefficient of enthalpy (Liquid) as a function of Temperature and Pressure
                          Temperature from 13.957 K to 33.14 K
                          Pressure from 2 kPa to 2000000 kPa
                          • Joule-Thomson coefficient (Gas) as a function of Temperature and Pressure
                            Temperature from 13.957 K to 1000 K
                            Pressure from 2 kPa to 1296.4 kPa
                            • Speed of sound
                              • Speed of sound (Liquid in equilibrium with Gas) as a function of Temperature
                                Temperature from 13.957 K to 33.14 K
                                50 experimental data points
                              • Speed of sound (Gas) as a function of Temperature and Pressure
                                Temperature from 13.957 K to 1000 K
                                Pressure from 2 kPa to 1296.4 kPa
                                35 experimental data points
                              • Speed of sound (Liquid) as a function of Temperature and Pressure
                                Temperature from 13.957 K to 33.14 K
                                Pressure from 2 kPa to 2000000 kPa
                                50 experimental data points
                              • Speed of sound (Gas in equilibrium with Liquid) as a function of Temperature
                                Temperature from 13.957 K to 33.145 K
                            • Surface tension (Liquid in equilibrium with Gas) as a function of Temperature
                              Temperature from 13.957 K to 33.14 K
                              34 experimental data points
                              • Viscosity
                                • Viscosity (Liquid in equilibrium with Gas) as a function of Temperature
                                  Temperature from 13.957 K to 33 K
                                  39 experimental data points
                                • Viscosity (Gas) as a function of Temperature and Pressure
                                  Temperature from 13.957 K to 1000 K
                                  Pressure from 0.1 kPa to 1296.4 kPa
                                  50 experimental data points
                                • Viscosity (Liquid) as a function of Temperature and Pressure
                                  Temperature from 13.957 K to 33.14 K
                                  Pressure from 0.1 kPa to 121000 kPa
                                  84 experimental data points
                              • Thermal conductivity
                                • Thermal conductivity (Liquid in equilibrium with Gas) as a function of Temperature
                                  Temperature from 13.957 K to 33 K
                                  12 experimental data points
                                • Thermal conductivity (Gas) as a function of Temperature and Pressure
                                  Temperature from 13.957 K to 1000 K
                                  Pressure from 0.1 kPa to 1296.4 kPa
                                  50 experimental data points
                                • Thermal conductivity (Liquid) as a function of Temperature and Pressure
                                  Temperature from 13.957 K to 33.14 K
                                  Pressure from 0.1 kPa to 121000 kPa
                                  53 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

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