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Ammonia - Properties at Gas-Liquid Equilibrium Conditions

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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/m2) = 1647.2 psi (=lbf /in2)


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 (=lbf /in2)
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!

Ammonia - Properties at Gas-Liquid Equilibrium Conditions - SI units
Temperature Pressure Density Specific
weight 		Cv Cp Thermal conductivity Dynamic Viscosity Kinematic
vicosity
[K] [°C] [MPa] [bara] [g/l],
[kg/m3 ] 		[N/m3 ] [kJ/kg K] [kJ/kg K] [mW/m K] [kcal(IT)/(h m K)] [µPa s] [cSt],
[m2/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!

Ammonia - Properties at Gas-Liquid Equilibrium Conditions - Imperial units
Temperature Pressure Density Specific
weight 		Cv Cp Thermal
conductivity 		Dynamic viscosity Kinematic
viscosity
[K] [°F] [psia] [lb/ft3 ] [sl/ft3 *10-3 ] [lbf /ft3 ] [Btu(IT)/lb K] [Btu(IT)/lb K] [Btu(IT)/(h ft °F)] [lbf s/ft2*10-6 ] [lbm s/ft s*10-6 ] [ft2/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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