Isothermal Properties for Hydrogen
- Fluid Data
- Auxiliary Data
- Additional Information
- Other Data Available:
Isothermal Data for T = 288.00 K
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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)||33.145 K|
|Critical pressure (Pc)||1.2964 MPa|
|Critical density (Dc)||15.508 mol/l|
|Normal boiling point||20.369 K|
|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
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