Isobaric Properties for Parahydrogen

• Fluid Data
• Auxiliary Data
• References and Notes
• Notes
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Fluid Data

Isobaric Data for P = 24.000 psia

Auxiliary Data

Reference States, Normal Boiling Point Convention

Additional fluid properties

References and Notes

Equation of state

Leachman, J.W., Jacobsen, R.T, Penoncello, S.G., and Lemmon, E.W., "Fundamental Equations of State for Parahydrogen, Normal Hydrogen, and Orthohydrogen," J. Phys. Chem. Ref. Data, 38(3):721-748, 2009.

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 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 with the Maxwell criterion are 0.1% for each property.

Auxillary model, Cp0

Leachman, J.W., Jacobsen, R.T, Penoncello, S.G., and Lemmon, E.W., 2009.

Auxillary model, PX0

Leachman, J.W., Jacobsen, R.T, Penoncello, S.G., and Lemmon, E.W., 2009.

Auxillary model, PH0

Leachman, J.W., Jacobsen, R.T, Penoncello, S.G., and Lemmon, E.W., 2009.

Viscosity

Muzny, C.D., Huber, M.L., and Kazakov, A.F., "Correlation for the Viscosity of Normal Hydrogen Obtained from Symbolic Regression," J. Chem. Eng. Data, 58:969-979, 2013.

The estimated uncertainty is 4 % for the saturated liquid from the triple point to 31 K, with larger deviations as the critical region is approached. The estimated uncertainty is 4 % for the supercritical fluid phase at pressures to 200 MPa. For the limited range of 200 K to 400 K at pressures up to 0.1 MPa, the uncertainty is 0.1 %.

Thermal conductivity

Assael, M.J., Assael. J.-A.M., Huber, M.L., Perkins, R.A., and Takata, Y., "Correlation of the Thermal Conductivity of Normal and Parahydrogen from the Triple Point to 1000 K and up to 100 MPa," J. Phys. Chem. Ref. Data, 40(3), 033101, 2011.

For the region from the triple point to 300 K at pressures to 20 MPa, the estimated uncertainty is 4%, with the exception of the critical region. The uncertainty is estimated to be 6% for temperatures from 400 K to 1000 K and pressures to 100 MPa. The correlation behaves in a physically reasonable manner for extrapolations to higher pressures at temperatures below 400 K, but will be subject to larger uncertainties.

Auxillary model, the thermal conductivity critical enhancement

Assael, M.J., Assael. J.-A.M., Huber, M.L., Perkins, R.A., and Takata, Y., 2011.

Surface tension

Dielectric constant

Metling line

Younglove, B.A., "Thermophysical Properties of Fluids. I. Argon, Ethylene, Parahydrogen, Nitrogen, Nitrogen Trifluoride, and Oxygen," J. Phys. Chem. Ref. Data, Vol. 11, Suppl. 1, pp. 1-11, 1982.

Sublimation line

Based on G.N. Brown and W.T. Ziegler, Adv. Cryo. Eng., 25:662-670, 1979. Modified to match the triple point of the equation of state.

Vapor pressure

Functional Form: P=Pc*EXP[SUM(Ni*Theta^ti)*Tc/T] where Theta=1-T/Tc, Tc and Pc are the reducing parameters below, which are followed by rows containing Ni and ti.

Saturated liquid density

Lemmon, C.K. and Lemmon, E.W., 2010.

Functional Form: D=Dc*[1+SUM(Ni*Theta^ti)] where Theta=1-T/Tc, Tc and Dc are the reducing parameters below, which are followed by rows containing Ni and ti.

Saturated liquid volume

Lemmon, C.K. and Lemmon, E.W., 2010.

Functional Form: D=Dc*EXP[SUM(Ni*Theta^ti)] where Theta=1-T/Tc, Tc and Dc are the reducing parameters below, which are followed by rows containing Ni and ti.

Notes

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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