Liquid Ammonia - Thermal Properties at Saturation Pressure
At atmospheric pressure, ammonia, NH3, is present as a liquid at temperatures below -33.6 °C (-28.5 °F). At 10 bara, the condensation/boiling point is 25 °C (77 °F). For more details about phase transitions, see ammonia phase diagram .
Below the tables, properties of liquid ammonia at saturation pressure as function of temperatur, are shown in figures.
Thermal properties of liquid ammonia at saturation pressure :
| Temperature - t - ( o C) | Density - ρ - (kg/m 3 ) | Specific Heat | Thermal Conductivity - λ - (W/(m K)) | Dynamic Viscosity - η - ( 10 -6 Pa s) | Prandtl's no. |
|---|---|---|---|---|---|
| -50 | 698 | 4.45 | 0.547 | 317 | 1.98 |
| 0 | 636 | 4.61 | 0.540 | 169 | 1.40 |
| 20 | 609 | 4.74 | 0.521 | 138 | 1.29 |
| 50 | 561 | 5.08 | 0.477 | 103 | 1.26 |
| Temperature - t - ( o F) | Density - ρ - (lb/ft 3 ) | Specific Heat | Thermal Conductivity - λ - (Btu/(hr ft o F) | Dynamic Viscosity - η - ( 10 -6 lb/(ft s)) | Prandtl's no. |
|---|---|---|---|---|---|
| -58 | 43.4 | 1.06 | 0.32 | 213 | 1.98 |
| 32 | 39.7 | 1.10 | 0.31 | 113 | 1.40 |
| 68 | 38 | 1.13 | 0.3 | 93 | 1.29 |
| 122 | 35 | 1.21 | 0.28 | 69 | 1.26 |
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