Thermodynamic Properties of para-Hydrogen

Temperature Pressure Density Volume Int. energy Enthalpy Entropy C, CT Sound speed Joule-Thomson Therm, cond. Viscosity 

TABLE 2 224 Thermodynamic Properties of para-Hydrogen (Concluded) 

Temperature K Pressure MPa Density mol/dm3 Volume dm3/mol Int. energy kj/mol Enthalpy kj/mol Entropy kJ/(mol-K) Cv kJ/(mol-K) cr kJ/(mol K) Sound speed m/s Joule-Thomson K/MPa Therm, cond. mW/(m-K) Viscosity juPas 

The uncertainties in density are 0.1% in the liquid phase, 0.25% in the vapor pnase, 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. The uncertainty in viscosity ranges from 4% to 15%. 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%. 

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