Isothermal Properties for Hydrogen
- Fluid Data
- Auxiliary Data
- Additional Information
- Other Data Available:
Isothermal Data for T = 15.000 C
Select a region with data to zoom. Select a region with no data or click the mouse on the plot to revert to the orginal display.
Moving the mouse pointer over or near a point will display the coordinates of the point. The number of digits shown do not reflect the uncertainty of the value.
On newer browsers the following keyboard commands are supported:
|L||Toggle log-log display if possible.|
|S||Toggle semilog (log Y) display if possible.|
|K||Move / hide legend (key). Repeated presses of this key will posiiton the legend in the following sequence: upper left, upper right, lower right, lower left, hidden.|
Click in or tab to the plot area to enable keyboard commands.
The following components were used in generating the plot:
- jQuery UI
- Plugins for Flot:
Additonal code used was developed at NIST: plot-data.js.
Use or mention of technologies or programs in this web site is not intended to imply recommendation or endorsement by the National Institute of Standards and Technology, nor is it intended to imply that these items are necessarily the best available for the purpose.
Reference States, Normal Boiling Point Convention
|Enthalpy||H = 0 at the normal boiling point for saturated liquid.|
|Entropy||S = 0 at the normal boiling point for saturated liquid.|
Additional fluid properties
|Critical temperature (Tc)||-240.005 C|
|Critical pressure (Pc)||12.964 bar|
|Critical density (Dc)||31.263 kg/m3|
|Normal boiling point||-252.781 C|
|Dipole moment||0.0 Debye|
Equation of state and auxiliary model
Leachman, J.W.; Jacobsen, R.T.; Lemmon, E.W., Fundamental Equations of State for Parahydrogen, Normal Hydrogen, and Orthohydrogen, to be published in J. Phys. Chem. Ref. Data, 2008. [all data]
Auxiliary model and surface tension
McCarty, R.D.; Hord, J.; Roder, H.M., Selected Properties of Hydrogen (Engineering Design Data), NBS Monograph 168, National Bureau of Standards, Boulder, CO, 1981, 0. [all data]
Thermal conductivity and dielectric constant
Kunz, O.; Klimeck, R.; Wagner, W.; Jaeschke, M., The GERG-2004 Wide-Range Reference Equation of State for Natural Gases and Other Mixtures, to be published as a GERG Technical Monograph, Fortschr.-Ber. VDI, VDI-Verlag, Düsseldorf, 2006. [all data]
Equation of state
The uncertainty in density is 0.1% at temperatures from the triple point to 250 K and at pressures up to 40 MPa, except in the critical region, where an uncertainty of 0.2% in pressure is generally attained. In the region between 250 and 450 K and at pressures from 0.1 to 300 MPa, the uncertainty in density is 0.04%. At temperatures between 450 and 1000 K, the uncertainty in density increases to 1%. At pressures between 300 and 2000 MPa, the uncertainty in density is 8%. Speed of sound data are represented within 0.5% below 100 MPa. The estimated uncertainty for heat capacities is 1.0%. The estimated uncertainties of vapor pressures and saturated liquid densities calculated using the Maxwell criterion are 0.2% for each property.
The uncertainty in thermal conductivity below 100 K is estimated to be 3% below 150 atm and up to 10% below 700 atm. For temperatures around 100 K at low densities, the uncertainty is about 1%. Above 100 K, the uncertainty is estimated to be on the order of 10%.
The uncertainty in viscosity ranges from 4% to 15%.
- Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
- 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 data contained therein have been selected on the basis of sound scientific judgment. 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 Database.
- Customer support for NIST Standard Reference Data products.