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Isobaric Properties for Parahydrogen

Fluid Data

Isobaric Data for P = 24.000 psia

Temperature (K)Pressure (psia)Density (kg/m3)Volume (m3/kg)Internal Energy (kJ/kg)Enthalpy (kJ/kg)Entropy (J/g*K)Cv (J/g*K)Cp (J/g*K)Sound Spd. (m/s)Joule-Thomson (F/psia)Viscosity (uPa*s)Therm. Cond. (W/m*K)Phase
14.00024.00076.9870.012989-51.576-49.427-2.93865.28677.49781363.6-0.01819625.5660.076890liquid
14.25024.00076.7760.013025-49.731-47.576-2.80765.09837.31741352.8-0.01861224.7060.078848liquid
14.50024.00076.5630.013061-47.924-45.763-2.68144.96257.19721341.7-0.01888323.9010.080716liquid
14.75024.00076.3490.013098-46.141-43.973-2.55914.86927.12661330.4-0.01902423.1460.082496liquid
15.00024.00076.1330.013135-44.370-42.196-2.43964.81037.09671318.9-0.01905322.4370.084189liquid
15.25024.00075.9160.013172-42.602-40.422-2.32234.77877.10021307.4-0.01898621.7690.085798liquid
15.50024.00075.6970.013211-40.830-38.644-2.20664.76917.13121295.9-0.01884021.1380.087324liquid
15.75024.00075.4750.013249-39.047-36.855-2.09214.77687.18481284.5-0.01863120.5410.088770liquid
16.00024.00075.2510.013289-37.249-35.050-1.97844.79817.25691273.2-0.01837219.9750.090138liquid
16.25024.00075.0250.013329-35.431-33.225-1.86534.82997.34431262.1-0.01807519.4380.091431liquid
16.50024.00074.7950.013370-33.589-31.377-1.75244.86987.44431251.2-0.01775018.9270.092649liquid
16.75024.00074.5630.013411-31.721-29.502-1.63964.91587.55451240.5-0.01740318.4410.093797liquid
17.00024.00074.3270.013454-29.825-27.599-1.52684.96627.67331229.9-0.01704217.9770.094875liquid
17.25024.00074.0890.013497-27.898-25.665-1.41395.01957.79901219.6-0.01667217.5340.095886liquid
17.50024.00073.8470.013542-25.940-23.699-1.30075.07497.93071209.5-0.01629517.1100.096832liquid
17.75024.00073.6010.013587-23.947-21.699-1.18735.13138.06731199.6-0.01591416.7040.097716liquid
18.00024.00073.3520.013633-21.921-19.665-1.07355.18828.20811189.8-0.01553216.3150.098539liquid
18.25024.00073.0990.013680-19.858-17.595-0.959285.24488.35251180.1-0.01515015.9410.099304liquid
18.50024.00072.8420.013728-17.760-15.488-0.844645.30098.50011170.6-0.01476915.5820.10001liquid
18.75024.00072.5810.013778-15.624-13.345-0.729545.35618.65051161.2-0.01439015.2360.10067liquid
19.00024.00072.3160.013828-13.451-11.163-0.613955.41018.80361151.8-0.01401214.9030.10127liquid
19.25024.00072.0460.013880-11.239-8.9425-0.497865.46278.95931142.5-0.01363614.5810.10182liquid
19.50024.00071.7710.013933-8.9885-6.6829-0.381235.51389.11751133.3-0.01326114.2710.10232liquid
19.75024.00071.4920.013988-6.6981-4.3835-0.264075.56339.27831124.1-0.01288713.9710.10277liquid
20.00024.00071.2080.014043-4.3674-2.0436-0.146335.61119.44171114.8-0.01251413.6810.10317liquid
20.25024.00070.9190.014101-1.99570.33759-0.0280175.65739.60791105.6-0.01214113.4000.10354liquid
20.50024.00070.6240.0141590.417622.76060.0909055.70199.77711096.3-0.01176813.1270.10385liquid
20.75024.00070.3240.0142202.87345.22640.210465.74479.94951086.9-0.01139412.8620.10413liquid
21.00024.00070.0180.0142825.37247.73570.330665.786010.1261077.5-0.01101712.6050.10436liquid
21.25024.00069.7060.0143467.915610.2890.451555.825610.3051067.9-0.01063812.3550.10455liquid
21.50024.00069.3880.01441210.50412.8890.573155.863810.4901058.3-0.01025512.1120.10471liquid
21.75024.00069.0630.01448013.13915.5350.695515.900510.6791048.5-0.009867511.8750.10482liquid
22.00024.00068.7310.01455015.82118.2290.818665.935910.8731038.6-0.009474411.6440.10490liquid
22.05524.00068.6570.01456516.41818.8280.845865.943510.9171036.4-0.009387111.5930.10491liquid
22.05524.0002.09380.47760374.84453.8720.5716.701613.123362.560.204391.18540.019047vapor
22.25024.0002.06730.48371376.37456.4120.6866.675113.007364.970.201071.19510.019196vapor
22.50024.0002.03470.49148378.32459.6520.8316.643612.870368.000.196981.20750.019387vapor
22.75024.0002.00330.49918380.25462.8520.9726.614612.744370.990.193061.22000.019579vapor
23.00024.0001.97310.50681382.16466.0221.1116.587912.628373.920.189301.23240.019770vapor

Auxiliary Data

Reference States, Normal Boiling Point Convention

Additional fluid properties

References

Equation of state

Younglove, B.A., Thermophysical Properties of Fluids. I. Argon, Ethylene, Parahydrogen, Nitrogen, Nitrogen Trifluoride, and Oxygen, J. Phys. Chem. Ref. Data, 1982, 11, 1-11. [all data]

Thermal conductivity and viscosity

McCarty, R.D.; Weber, L.A., Thermophysical properties of parahydrogen from the freezing liquid line to 5000 R for pressures to 10,000 psia, Tech. Note 617, National Bureau of Standards, Boulder, CO, 1972, 0. [all data]

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]

Dielectric constant and melting curve

Younglove, B.A., Thermophysical Properties of Fluids. I. Argon, Ethylene, Parahydrogen, Nitrogen, Nitrogen Trifluoride, and Oxygen, J. Phys. Chem. Ref. Data, 1982, 11, 1-11. [all data]

Additional Information

Equation of state

The uncertainties in density are 0.1% in the liquid phase, 0.25% in the vapor phase, and 0.2% in the supercritical region. The uncertainty in heat capacity is 3% and the uncertainty in speed of sound is 2% in the liquid phase and 1% elsewhere.

Note: The ideal gas equation was refit from calculations of piecewise Cp0 equation of McCarty

Thermal conductivity

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%.

Viscosity

The uncertainty in viscosity ranges from 4% to 15%.

Important Information About This Data

The data above are from an older version of the NIST Reference Fluid Thermodynamic and Transport Properties Database (REFPROP version 7). We will be updating our site to use the newer version (version 10) of this database in the future. Information on REFPROP version 10 can be found on theREFPROP web page. REFPROP version 10 includes additional data and features not available from this site.

Notes