Isothermal Properties for Ammonia
- Fluid Data
- Auxiliary Data
- References and Notes
- Notes
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Fluid Data
Isothermal Data for T = 25.000 C
| Temperature (C) | Pressure (bar) | Density (kg/m3) | Volume (m3/kg) | Internal Energy (kJ/mol) | Enthalpy (kJ/mol) | Entropy (J/mol*K) | Cv (J/mol*K) | Cp (J/mol*K) | Sound Spd. (m/s) | Joule-Thomson (K/bar) | Viscosity (uPa*s) | Therm. Cond. (W/m*K) | Phase |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25.000 | 0.90000 | 0.62414 | 1.6022 | 26.377 | 28.832 | 121.68 | 27.898 | 36.690 | 433.43 | 2.8340 | 10.091 | 0.025146 | vapor |
| 25.000 | 1.0000 | 0.69422 | 1.4405 | 26.369 | 28.822 | 120.77 | 27.974 | 36.822 | 433.15 | 2.8312 | 10.089 | 0.025171 | vapor |
| 25.000 | 1.1000 | 0.76445 | 1.3081 | 26.361 | 28.812 | 119.95 | 28.051 | 36.955 | 432.87 | 2.8284 | 10.086 | 0.025196 | vapor |
Auxiliary Data
Reference States, default for fluid
| Enthalpy | H = 28.989809 kJ/mol at 26.9 C and 0.010 bar. |
|---|---|
| Entropy | S = 159.539896 J/mol*K at 26.9 C and 0.010 bar. |
Additional fluid properties
| Critical temperature (Tc) | 132.41 C |
|---|---|
| Critical pressure (Pc) | 113.634 bar |
| Critical density (Dc) | 233.25 kg/m3 |
| Acentric factor | 0.256 |
| Normal boiling point | -33.318 C |
| Dipole moment | 1.47 Debye |
References and Notes
Equation of state
Gao, K., Wu, J., Bell, I.H., and Lemmon, E.W., "Thermodynamic Properties of Ammonia for Temperatures from the Melting Line to 725 K and Pressures to 1000 MPa," to be submitted to J. Phys. Chem. Ref. Data, 2018.
The uncertainties in the vapor phase in density are 0.1% at temperatures between 410 K and 580 K with pressures below 100 MPa, and 0.05% at temperatures between 220 K and 400 K with pressures below 10 MPa. In the liquid phase, the uncertainty in density is 0.05% at temperatures between 190 K and 400 K with pressures below 200 MPa. The uncertainty in density is 1.5% at pressures between 200 MPa and 1000 MPa. In the critical region, the uncertainty in density is estimated to be 1%.
The uncertainty in vapor pressure is 0.05% at temperatures between 200 K and 404 K. The uncertainty in saturated liquid density is 0.1% at temperatures between 195 K and 400 K. The uncertainty in saturated vapor density is 2% at temperatures between 220 K and 395 K. The uncertainties in speed of sound are 0.1% in the vapor phase at temperatures between 300 K and 375 K with pressures below 3.5 MPa, and 1% in the liquid phase at temperatures between 195 K and 410 K with pressures below 125 MPa. The uncertainties in isobaric heat capacity are 0.5% in the vapor phase at temperatures between 255 K and 425 K, and 5% in the liquid phase at temperatures between 330 K and 400 K with pressures below 11 MPa. The uncertainty in saturation heat capacity is 0.5% at temperatures between 200 K and 320 K.
Auxillary model, Cp0
Gao, K., Wu, J., Bell, I.H., and Lemmon, E.W., 2018.
Auxillary model, PX0
Gao, K., Wu, J., Bell, I.H., and Lemmon, E.W., 2018.
Viscosity
Monogenidou, S.A., Assael, M.J., and Huber, M.L. "Reference Correlation of the Viscosity of Ammonia from the Triple Point to 700 K and up to 50 MPa," accepted for publication in J. Phys. Chem. Ref. Data, 2018.
The estimated uncertainty for pressures up to 50 MPa is 4%. The equation may be used up to 100 MPa but the uncertainty will be larger, especially at lower temperatures.
Auxillary model, the collision integral
Monogenidou, S., Assael, M.J., and Huber, M.L., 2018.
Thermal conductivity
Monogenidou, S.A., Assael, M.J., and Huber, M.L., "Reference Correlations for Thermal Conductivity of Ammonia from the Triple Point to 680 K and up to 80 MPa," accepted for publication in J. Phys. Chem. Ref. Data, 2018.
The estimated uncertainty for pressures up to 80 MPa is 6.8%. The equation may be used up to 100 MPa but the uncertainty will be larger, and also larger near the critical point.
Auxillary model, the thermal conductivity critical enhancement
Monogenidou, S.A., Assael, M.J., and Huber, M.L., 2018.
Surface tension
Mulero, A.; Cachadiña, I.; Parra, M.I., Recommended Correlations for the Surface Tension of Common Fluids, J. Phys. Chem. Ref. Data, 2012, 41, 4, 043105, https://doi.org/10.1063/1.4768782 . [all data]Metling line
Haar, L.; Gallagher, J.S., Thermodynamic Properties of Ammonia, J. Phys. Chem. Ref. Data, 1978, 7, 3, 635-792, https://doi.org/10.1063/1.555579 . [all data]Sublimation line
Fray, N.; Schmitt, B., Sublimation of ices of astrophysical interest: A bibliographic review, Planetary and Space Science, 2009, 57, 14-15, 2053-2080, https://doi.org/10.1016/j.pss.2009.09.011 . [all data]Based on N. Fray and B. Schmitt, Planet. Space Sci. 57:2053-2080, 2009. Modified to match the triple point of the equation of state.
Vapor pressure
Gao, K., 2018.
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
Gao, K., 2018.
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
Gao, K., 2018.
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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