Ammonia - Properties at Gas-Liquid Equilibrium Conditions
At standard conditions, ammonia is a gas. However, at low temperature and/or high pressures the gas becomes a liquid, and at more extreme conditions, a solid. The ammonia phase diagram shows the phase behavior with changes in temperature and pressure. The curve between the triple point and the critical point shows the ammonia boiling point with changes in pressure.
Critical point : The end point of the pressure-temperature curve that designates conditions under which a liquid and its vapor can coexist. At higher temperatures, the gas cannot be liquefied by pressure alone. At the critical point, defined by the critical temperature T c and the critical pressure P c , phase boundaries vanish.
Critical temperature of ammonia: 405.56 K =132.41 °C = 270.34 °F
Critical pressure of ammonia: 112.08 atm = 113.41 bar = 11.357 MPa (MN/m 2 ) = 1647.2 psi (=lb f /in 2 )
Triple point : The temperature and pressure at which the three phases (gas, liquid, and solid) of a substance coexist in thermodynamic equilibrium
Triple point pressure of ammonia: 0.0601 atm = 0.0609 bar = 6090 Pa = 0.8832 psi (=lb f /in 2 )
Triple point temperature of ammonia: 195.5 K = -77.65 °C = -107.77 °F
The figures below show the changes in thermophysical properties along the ammonia boiling and condensation curves: Density , viscosity , heat capacity , thermal conductivity .
Tabulated values given in SI and imperial units, and unit converters are given below the figures.
See also properties of Ammonia at varying temperature and pressure: Density and specific weight , Dynamic and kinematic viscosity , Prandtl Number , Specific Heat (Heat Capacity) and Thermal Conductivity , and Thermophysical properties at standard conditions and Vapour pressure at gas-liquid equilibrium ,
Phase diagram of ammonia:
The following figures show how the properties of ammonia change along the boiling and condensation curves (shown in the phase diagram above) - SI units:
Properties of ammonia along the boiling/condensation curve, SI units:
For full table with Specific Weight, Specific Heat, Thermal Conductivity, Dynematic and Kinematic Viscosity - rotate the screen!
| Temperature | Pressure | Density | Specific weight | Cv | Cp | Thermal conductivity | Dynamic Viscosity | Kinematic vicosity | |||
| [K] | [°C] | [MPa] | [bara] | [g/l], [kg/m 3 ] | [N/m 3 ] | [kJ/kg K] | [kJ/kg K] | [mW/m K] | [kcal(IT)/(h m K)] | [µPa s] | [cSt], [m 2 /s*10 -6 ] |
| Liquid | |||||||||||
| 195.5 | -77.7 | 0.006091 | 0.06091 | 732.9 | 7188 | 2.9342 | 4.2020 | 818.99 | 0.70420 | 559.57 | 0.76347 |
| 210 | -63.2 | 0.0177 | 0.1774 | 717.2 | 7033 | 2.9077 | 4.2846 | 768.02 | 0.66038 | 414.98 | 0.57862 |
| 220 | -53.2 | 0.0338 | 0.3379 | 705.8 | 6922 | 2.8893 | 4.3421 | 733.17 | 0.63041 | 346.68 | 0.49119 |
| 230 | -43.2 | 0.0604 | 0.6041 | 694.0 | 6806 | 2.8716 | 4.3969 | 698.80 | 0.60086 | 294.94 | 0.42500 |
| 240 | -33.2 | 0.1022 | 1.022 | 681.8 | 6686 | 2.8544 | 4.4486 | 665.09 | 0.57187 | 254.85 | 0.37380 |
| 250 | -23.2 | 0.1649 | 1.649 | 669.2 | 6563 | 2.8376 | 4.4982 | 632.16 | 0.54356 | 223.08 | 0.33336 |
| 270 | -3.2 | 0.3811 | 3.811 | 642.9 | 6305 | 2.8051 | 4.5991 | 568.85 | 0.48912 | 176.06 | 0.27386 |
| 290 | 16.9 | 0.7774 | 7.774 | 614.8 | 6029 | 2.7753 | 4.7215 | 508.99 | 0.43765 | 142.74 | 0.23216 |
| 300 | 26.9 | 1.062 | 10.62 | 600.0 | 5884 | 2.7620 | 4.8000 | 480.30 | 0.41298 | 129.30 | 0.21550 |
| 310 | 36.9 | 1.424 | 14.24 | 584.5 | 5732 | 2.7512 | 4.8964 | 452.23 | 0.38885 | 117.49 | 0.20101 |
| 320 | 46.9 | 1.873 | 18.73 | 568.2 | 5572 | 2.7430 | 5.0180 | 424.80 | 0.36526 | 106.90 | 0.18814 |
| 330 | 56.9 | 2.421 | 24.21 | 551.0 | 5403 | 2.7383 | 5.1756 | 397.96 | 0.34218 | 97.33 | 0.17665 |
| 350 | 76.9 | 3.866 | 38.66 | 512.4 | 5025 | 2.7460 | 5.6706 | 345.32 | 0.29692 | 80.43 | 0.15696 |
| 370 | 96.9 | 5.878 | 58.78 | 465.3 | 4563 | 2.7960 | 6.7142 | 293.07 | 0.25199 | 65.49 | 0.14075 |
| 390 | 116.9 | 8.605 | 86.05 | 399.6 | 3919 | 2.9546 | 10.3047 | 239.65 | 0.20606 | 50.88 | 0.12731 |
| 400 | 126.9 | 10.31 | 103.1 | 344.6 | 3379 | 3.1771 | 22.7274 | 216.00 | 0.18573 | 41.80 | 0.12132 |
| 405.4 | 132.3 | 11.34 | 113.4 | 225.0 | 2207 | ||||||
| Gas | |||||||||||
| 195.5 | -77.7 | 0.006091 | 0.06091 | 0.0641 | 0.6286 | 1.5566 | 2.0627 | 19.636 | 0.016884 | 6.8396 | 106.71 |
| 210 | -63.2 | 0.01774 | 0.1774 | 0.1746 | 1.712 | 1.5885 | 2.1115 | 19.860 | 0.017077 | 7.2115 | 41.315 |
| 220 | -53.2 | 0.03379 | 0.3379 | 0.3188 | 3.127 | 1.6196 | 2.1598 | 20.132 | 0.017310 | 7.4846 | 23.475 |
| 230 | -43.2 | 0.06041 | 0.6041 | 0.5486 | 5.380 | 1.6584 | 2.2210 | 20.503 | 0.017629 | 7.7679 | 14.159 |
| 240 | -33.2 | 0.1022 | 1.022 | 0.8970 | 8.796 | 1.7053 | 2.2983 | 20.978 | 0.018038 | 8.0587 | 8.9843 |
| 250 | -23.2 | 0.1649 | 1.649 | 1.404 | 13.77 | 1.7602 | 2.3914 | 21.560 | 0.018538 | 8.3552 | 5.9525 |
| 270 | -3.1 | 0.3811 | 3.811 | 3.087 | 30.27 | 1.8938 | 2.6340 | 23.079 | 0.019844 | 8.9595 | 2.9023 |
| 290 | 16.9 | 0.7744 | 7.744 | 6.074 | 59.56 | 2.0567 | 2.9669 | 25.138 | 0.021615 | 9.5771 | 1.5768 |
| 300 | 26.9 | 1.062 | 10.62 | 8.251 | 80.91 | 2.1480 | 3.1770 | 26.410 | 0.022709 | 9.894 | 1.1991 |
| 310 | 36.9 | 1.424 | 14.24 | 11.02 | 108.1 | 2.2456 | 3.4233 | 27.872 | 0.023966 | 10.220 | 0.9275 |
| 320 | 46.9 | 1.873 | 18.73 | 14.51 | 142.3 | 2.3490 | 3.7180 | 29.570 | 0.025426 | 10.560 | 0.7278 |
| 330 | 56.9 | 2.421 | 24.21 | 18.89 | 185.3 | 2.4583 | 4.0774 | 31.559 | 0.027136 | 10.927 | 0.5783 |
| 350 | 76.9 | 3.866 | 38.66 | 31.34 | 307.3 | 2.6983 | 5.1248 | 36.900 | 0.031728 | 11.792 | 0.3763 |
| 370 | 96.9 | 5.878 | 58.78 | 51.73 | 507.3 | 2.9795 | 7.2139 | 46.149 | 0.039681 | 13.053 | 0.2523 |
| 390 | 116.9 | 8.605 | 86.05 | 90.23 | 884.8 | 3.3443 | 14.192 | 70.114 | 0.060287 | 15.527 | 0.1721 |
| 400 | 126.9 | 10.31 | 103.1 | 131.1 | 1286 | 3.5982 | 34.923 | 113.540 | 0.097627 | 18.529 | 0.1413 |
| 405.4 | 132.3 | 11.33 | 113.3 | 225.0 | 2207 | ||||||
Properties of ammonia along the boiling/condensation curve, Imperial units:
For full table with Specific Weight, Specific Heat, Thermal Conductivity, Dynematic and Kinematic Viscosity - rotate the screen!
| Temperature | Pressure | Density | Specific weight | Cv | Cp | Thermal conductivity | Dynamic viscosity | Kinematic viscosity | |||
| [K] | [°F] | [psia] | [lb/ft 3 ] | [sl/ft 3 *10 -3 ] | [lb f /ft 3 ] | [Btu(IT)/lb K] | [Btu(IT)/lb K] | [Btu(IT)/(h ft °F)] | [lb f s/ft 2 *10 -6 ] | [lb m s/ft s*10 -6 ] | [ft 2 /s*10 -6 ] |
| Liquid | |||||||||||
| 195.5 | -107.8 | 0.8835 | 45.76 | 1422 | 45.76 | 0.70081 | 1.0036 | 0.47320 | 11.687 | 376.01 | 8.2179 |
| 210 | -81.7 | 2.573 | 44.77 | 1392 | 44.77 | 0.69449 | 1.0234 | 0.44375 | 8.6670 | 278.85 | 6.2282 |
| 220 | -63.7 | 4.901 | 44.06 | 1369 | 44.06 | 0.69009 | 1.0371 | 0.42362 | 7.2406 | 232.96 | 5.2871 |
| 230 | -45.7 | 8.761 | 43.32 | 1347 | 43.32 | 0.68586 | 1.0502 | 0.40376 | 6.1599 | 198.19 | 4.5746 |
| 240 | -27.7 | 14.83 | 42.56 | 1323 | 42.56 | 0.68176 | 1.0625 | 0.38428 | 5.3227 | 171.25 | 4.0235 |
| 250 | -9.7 | 23.92 | 41.78 | 1298 | 41.78 | 0.67774 | 1.0744 | 0.36526 | 4.6591 | 149.90 | 3.5882 |
| 270 | 26.3 | 55.27 | 40.13 | 1247 | 40.13 | 0.66999 | 1.0985 | 0.32868 | 3.6771 | 118.31 | 2.9478 |
| 290 | 62.3 | 112.8 | 38.38 | 1193 | 38.38 | 0.66286 | 1.1277 | 0.29409 | 2.9812 | 95.92 | 2.4989 |
| 300 | 80.3 | 154.0 | 37.46 | 1164 | 37.46 | 0.65969 | 1.1465 | 0.27751 | 2.7005 | 86.89 | 2.3196 |
| 310 | 98.3 | 206.5 | 36.49 | 1134 | 36.49 | 0.65711 | 1.1695 | 0.26129 | 2.4538 | 78.95 | 2.1636 |
| 320 | 116.3 | 271.6 | 35.47 | 1102 | 35.47 | 0.65515 | 1.1985 | 0.24544 | 2.2327 | 71.83 | 2.0251 |
| 330 | 134.3 | 351.1 | 34.39 | 1069 | 34.39 | 0.65403 | 1.2362 | 0.22994 | 2.0327 | 65.40 | 1.9014 |
| 350 | 170.3 | 560.7 | 31.99 | 994.2 | 31.99 | 0.65587 | 1.3544 | 0.19952 | 1.6798 | 54.05 | 1.6895 |
| 370 | 206.3 | 852.5 | 29.05 | 902.8 | 29.05 | 0.66782 | 1.6037 | 0.16933 | 1.3678 | 44.01 | 1.5151 |
| 390 | 242.3 | 1248 | 24.95 | 775.4 | 24.95 | 0.70568 | 2.4612 | 0.13847 | 1.0626 | 34.19 | 1.3703 |
| 400 | 260.3 | 1495 | 21.51 | 668.6 | 21.51 | 0.75883 | 5.4283 | 0.12480 | 0.8731 | 28.09 | 1.3058 |
| 405.4 | 270.1 | 1645 | 14.05 | 436.6 | 14.05 | ||||||
| Gas | |||||||||||
| 195.5 | -107.8 | 0.8835 | 0.00400 | 0.1244 | 0.00400 | 0.37178 | 0.49267 | 0.011345 | 0.14285 | 4.5960 | 1148.6 |
| 210 | -81.7 | 2.573 | 0.01090 | 0.3387 | 0.01090 | 0.37939 | 0.50432 | 0.011475 | 0.15062 | 4.8459 | 444.71 |
| 220 | -63.7 | 4.901 | 0.01990 | 0.6186 | 0.01990 | 0.38683 | 0.51585 | 0.011632 | 0.15632 | 5.0294 | 252.68 |
| 230 | -45.7 | 8.761 | 0.03425 | 1.065 | 0.03425 | 0.39611 | 0.53048 | 0.011846 | 0.16224 | 5.2198 | 152.40 |
| 240 | -27.7 | 14.83 | 0.05600 | 1.740 | 0.05600 | 0.40730 | 0.54893 | 0.012121 | 0.16831 | 5.4152 | 96.707 |
| 250 | -9.7 | 23.92 | 0.08763 | 2.724 | 0.08763 | 0.42042 | 0.57117 | 0.012457 | 0.17450 | 5.6144 | 64.072 |
| 270 | 26.3 | 55.27 | 0.1927 | 5.990 | 0.1927 | 0.45232 | 0.62911 | 0.013335 | 0.18712 | 6.0205 | 31.240 |
| 290 | 62.3 | 112.3 | 0.3792 | 11.79 | 0.3792 | 0.49124 | 0.70864 | 0.014524 | 0.20002 | 6.4355 | 16.972 |
| 300 | 80.3 | 154.0 | 0.5151 | 16.01 | 0.5151 | 0.51304 | 0.75881 | 0.015259 | 0.20664 | 6.6485 | 12.907 |
| 310 | 98.3 | 206.5 | 0.6879 | 21.38 | 0.6879 | 0.53634 | 0.81763 | 0.016104 | 0.21345 | 6.8675 | 9.9830 |
| 320 | 116.3 | 271.6 | 0.9058 | 28.15 | 0.9058 | 0.56105 | 0.88803 | 0.017085 | 0.22055 | 7.0960 | 7.8337 |
| 330 | 134.3 | 351.1 | 1.180 | 36.66 | 1.180 | 0.58716 | 0.97388 | 0.018234 | 0.22822 | 7.3426 | 6.2250 |
| 350 | 170.3 | 560.7 | 1.956 | 60.80 | 1.956 | 0.64446 | 1.2240 | 0.021320 | 0.24628 | 7.9239 | 4.0506 |
| 370 | 206.3 | 852.5 | 3.230 | 100.4 | 3.229 | 0.71164 | 1.7230 | 0.026664 | 0.27262 | 8.7712 | 2.7160 |
| 390 | 242.3 | 1248 | 5.633 | 175.1 | 5.633 | 0.79877 | 3.3896 | 0.040511 | 0.32429 | 10.434 | 1.8523 |
| 400 | 260.3 | 1495 | 8.184 | 254.4 | 8.184 | 0.85941 | 8.3411 | 0.065602 | 0.38699 | 12.451 | 1.5214 |
| 405.4 | 270.1 | 1644 | 14.05 | 436.6 | 14.05 | ||||||
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