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Ammonia - Vapour Pressure at gas-liquid equilibrium

Figures and table showing ammonia saturation pressure at boiling point, SI and Imperial units

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Anhydrous ammonia, NH3: Thermophysical properties

  • a colorless non-flammable liquefied gas
  • vapor is lighter than air - 0.6 compared to air 1.0
  • ignition temperature 1204oF (651 oC)(vapor concentration between 15% and 28%)
  • corrodes galvanized metals, cast iron, copper, brass or copper alloys
  • weight of liquid ammonia 5.15 pounds per gallon (water weight 8.33 pounds per gallon)
  • boiling point liquid ammonia at atmospheric pressure-28o(-2.2 oC)
  • liquid ammonia expands to 850 times its liquid volume at atmospheric pressure

The vapour pressure of ammonia is the pressure at which ammonia gas is in thermodynamic equilibrium with its condensed state. At higher pressures ammonia would condense. At this equilibrium condition the vapor pressure is the saturation pressure.

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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.

Ammonia Temperature Pressure Diagram

Saturation (boiling pressures) of liquid ammonia at different temperatures are indicated in the figures below. An ammonia phase diagram is also included:

Ammonia temperature pressure C

Ammonia - NH3 - temperature and pressure chart - psi, degrees Fahrenheit

 Ammonia phase diagram C

 

Temperature Pressure Vacuum 1)
[K] [°C] [°F] [MPa] [bara] [psia] [mm Hg], [torr] [in Hg]
222 -51.1 -60 0.0386 0.39 5.6 460 18.1
223 -50.0 -58 0.0407 0.41 5.9 445 17.5
224 -49.4 -57 0.0421 0.42 6.1 435 17.1
224 -48.9 -56 0.0434 0.43 6.3 424 16.7
225 -48.3 -55 0.0448 0.45 6.5 414 16.3
225 -47.8 -54 0.0469 0.47 6.8 398 15.7
226 -47.2 -53 0.0483 0.48 7.0 388 15.3
226 -46.7 -52 0.0496 0.50 7.2 378 14.9
227 -46.1 -51 0.0510 0.51 7.4 367 14.5
228 -45.6 -50 0.0531 0.53 7.7 352 13.9
228 -45.0 -49 0.0545 0.54 7.9 342 13.4
229 -44.4 -48 0.0565 0.57 8.2 326 12.8
229 -43.9 -47 0.0579 0.58 8.4 316 12.4
230 -43.3 -46 0.0600 0.60 8.7 300 11.8
230 -42.8 -45 0.0621 0.62 9.0 285 11.2
231 -42.2 -44 0.0634 0.63 9.2 274 10.8
231 -41.7 -43 0.0655 0.66 9.5 259 10.2
232 -41.1 -42 0.0676 0.68 9.8 243 9.6
233 -40.6 -41 0.0696 0.70 10.1 228 9.0
233 -40.0 -40 0.0717 0.72 10.4 212 8.4
234 -39.4 -39 0.0738 0.74 10.7 197 7.7
234 -38.9 -38 0.0758 0.76 11.0 181 7.1
235 -38.3 -37 0.0786 0.79 11.4 161 6.3
235 -37.8 -36 0.0807 0.81 11.7 145 5.7
236 -37.2 -35 0.0834 0.83 12.1 124 4.9
236 -36.7 -34 0.0855 0.85 12.4 109 4.3
237 -36.1 -33 0.0883 0.88 12.8 88 3.5
238 -35.6 -32 0.0903 0.90 13.1 73 2.9
238 -35.0 -31 0.0931 0.93 13.5 52 2.0
239 -34.4 -30 0.0958 0.96 13.9 31 1.2
239 -33.9 -29 0.0986 0.99 14.3 11 0.4
Gauge pressure2)
[psig]
240 -33.3 -28 0.1014 1.01 14.7 0
240 -32.8 -27 0.1041 1.04 15.1 0.4
241 -32.2 -26 0.1076 1.08 15.6 0.9
241 -31.7 -25 0.1103 1.10 16.0 1.3
242 -31.1 -24 0.1131 1.13 16.4 1.7
243 -30.6 -23 0.1165 1.17 16.9 2.2
243 -30.0 -22 0.1193 1.19 17.3 2.6
244 -29.4 -21 0.1227 1.23 17.8 3.1
244 -28.9 -20 0.1262 1.26 18.3 3.6
245 -28.3 -19 0.1296 1.30 18.8 4.1
245 -27.8 -18 0.1331 1.33 19.3 4.6
246 -27.2 -17 0.1365 1.37 19.8 5.1
246 -26.7 -16 0.1400 1.40 20.3 5.6
247 -26.1 -15 0.1441 1.44 20.9 6.2
248 -25.6 -14 0.1475 1.48 21.4 6.7
248 -25.0 -13 0.1517 1.52 22.0 7.3
249 -24.4 -12 0.1558 1.56 22.6 7.9
249 -23.9 -11 0.1600 1.60 23.2 8.5
250 -23.3 -10 0.1634 1.63 23.7 9
250 -22.8 -9 0.1682 1.68 24.4 9.7
251 -22.2 -8 0.1724 1.72 25.0 10.3
251 -21.7 -7 0.1765 1.77 25.6 10.9
252 -21.1 -6 0.1813 1.81 26.3 11.6
253 -20.6 -5 0.1855 1.85 26.9 12.2
253 -20.0 -4 0.1903 1.90 27.6 12.9
254 -19.4 -3 0.1951 1.95 28.3 13.6
254 -18.9 -2 0.1999 2.00 29.0 14.3
255 -18.3 -1 0.2048 2.05 29.7 15
255 -17.8 0 0.2096 2.10 30.4 15.7
256 -17.2 1 0.2151 2.15 31.2 16.5
256 -16.7 2 0.2199 2.20 31.9 17.2
257 -16.1 3 0.2255 2.25 32.7 18
258 -15.6 4 0.2310 2.31 33.5 18.8
258 -15.0 5 0.2365 2.36 34.3 19.6
259 -14.4 6 0.2420 2.42 35.1 20.4
259 -13.9 7 0.2475 2.48 35.9 21.2
260 -13.3 8 0.2537 2.54 36.8 22.1
260 -12.8 9 0.2592 2.59 37.6 22.9
261 -12.2 10 0.2654 2.65 38.5 23.8
261 -11.7 11 0.2717 2.72 39.4 24.7
262 -11.1 12 0.2779 2.78 40.3 25.6
263 -10.6 13 0.2841 2.84 41.2 26.5
263 -10.0 14 0.2910 2.91 42.2 27.5
264 -9.4 15 0.2972 2.97 43.1 28.4
264 -8.9 16 0.3041 3.04 44.1 29.4
265 -8.3 17 0.3110 3.11 45.1 30.4
265 -7.8 18 0.3178 3.18 46.1 31.4
266 -7.2 19 0.3254 3.25 47.2 32.5
266 -6.7 20 0.3323 3.32 48.2 33.5
267 -6.1 21 0.3399 3.40 49.3 34.6
268 -5.6 22 0.3475 3.47 50.4 35.7
268 -5.0 23 0.3551 3.55 51.5 36.8
269 -4.4 24 0.3627 3.63 52.6 37.9
269 -3.9 25 0.3702 3.70 53.7 39
270 -3.3 26 0.3785 3.79 54.9 40.2
270 -2.8 27 0.3868 3.87 56.1 41.4
271 -2.2 28 0.3951 3.95 57.3 42.6
271 -1.7 29 0.4033 4.03 58.5 43.8
272 -1.1 30 0.4116 4.12 59.7 45
278 4.4 40 0.5054 5.05 73.3 58.6
283 10.0 50 0.6150 6.15 89.2 74.5
289 15.6 60 0.7419 7.42 107.6 92.9
294 21.1 70 0.8880 8.88 128.8 114.1
298 24.4 76 0.9860 9.86 143.0 128.3
298 25.0 77 1.00 10.0 145.4 130.7
299 25.6 78 1.02 10.2 147.9 133.2
299 26.1 79 1.04 10.4 150.5 135.8
300 26.7 80 1.05 10.5 153.0 138.3
300 27.2 81 1.07 10.7 155.6 140.9
301 27.8 82 1.09 10.9 158.3 143.6
301 28.3 83 1.11 11.1 161.0 146.3
302 28.9 84 1.13 11.3 163.7 149.0
303 29.4 85 1.15 11.5 166.4 151.7
303 30.0 86 1.17 11.7 169.2 154.5
304 30.6 87 1.19 11.9 172.0 157.3
304 31.1 88 1.21 12.1 174.8 160.1
305 31.7 89 1.23 12.3 177.7 163.0
305 32.2 90 1.25 12.5 180.6 165.9
306 32.8 91 1.27 12.7 183.6 168.9
306 33.3 92 1.29 12.9 186.6 171.9
307 33.9 93 1.31 13.1 189.6 174.9
308 34.4 94 1.33 13.3 192.7 178.0
308 35.0 95 1.35 13.5 195.8 181.1
309 35.6 96 1.37 13.7 198.9 184.2
309 36.1 97 1.39 13.9 202.1 187.4
310 36.7 98 1.42 14.2 205.3 190.6
310 37.2 99 1.44 14.4 208.6 193.9
311 37.8 100 1.46 14.6 211.9 197.2
311 38.3 101 1.48 14.8 215.2 200.5
312 38.9 102 1.51 15.1 218.6 203.9
313 39.4 103 1.53 15.3 222.0 207.3
313 40.0 104 1.55 15.5 225.4 210.7
314 40.6 105 1.58 15.8 228.9 214.2
314 41.1 106 1.60 16.0 232.5 217.8
315 41.7 107 1.63 16.3 236.0 221.3
315 42.2 108 1.65 16.5 239.7 225.0
316 42.8 109 1.68 16.8 243.3 228.6
316 43.3 110 1.70 17.0 247.0 232.3
317 43.9 111 1.73 17.3 250.8 236.1
318 44.4 112 1.75 17.5 254.5 239.8
318 45.0 113 1.78 17.8 258.4 243.7
319 45.6 114 1.81 18.1 262.2 247.5
319 46.1 115 1.84 18.4 266.2 251.5
320 46.7 116 1.86 18.6 270.1 255.4
320 47.2 117 1.89 18.9 274.1 259.4
321 47.8 118 1.92 19.2 278.2 263.5
321 48.3 119 1.95 19.5 282.3 267.6
322 48.9 120 1.97 19.7 286.4 271.7
330 56.9 134 2.42 24.2 351.1 336.4
350 76.9 170 3.87 38.7 560.7 546.0
370 96.9 206 5.88 58.8 852.5 837.8
390 117 242 8.60 86.0 1248 1233
400 127 260 10.3 103 1495 1480
405 132 270 11.3 113 1645 1630

1) Between -60 oF (-51 oC) to -28 oF (-33 oC) the vacuum pressure values in the seventh and eighth column are represented in mm and inches Mercury
2) The gauge numbers shown in that seventh column all are vs atmospheric pressure at sea level (14.7 psia)

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