Pressure and Temperature Chart of Ammonia - NH₃

A temperature (^oF) and pressure (psia, psig) chart for Ammonia - NH₃

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Anhydrous ammonia NH₃

a colorless non-flammable liquefied gas
vapor lighter than air - 0.6 compared to air 1.0
ignition temperature 1204^oF (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 -28^oF
liquid ammonia expands to 850 times its liquid volume at atmospheric pressure

Ammonia Temperature Pressure Diagram

Boiling pressures of liquid ammonia at different temperatures are indicated in the diagram and charts below:

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

Temperature	Pressure
^oF	psia	psig
-60	5.6	18.6
-58	5.9	17.8
-57	6.1	17.4
-56	6.3	17.0
-55	6.5	16.6
-54	6.8	16.2
-53	7.0	15.7
-52	7.2	15.3
-51	7.4	14.8
-50	7.7	14.3
-49	7.9	13.8
-48	8.2	13.3
-47	8.4	12.8
-46	8.7	12.2
-45	9.0	11.7
-44	9.2	11.1
-43	9.5	10.6
-42	9.8	10.0
-41	10.1	9.3
-40	10.4	8.7
-39	10.7	8.1
-38	11.0	7.4
-37	11.4	6.8
-36	11.7	6.1
-35	12.1	5.4
-34	12.4	4.7
-33	12.8	3.9
-32	13.1	3.2
-31	13.5	2.4
-30	13.9	1.6
-29	14.3	0.8
-28	14.7	0.0
-27	15.1	0.4
-26	15.6	0.8
-25	16.0	1.3
-24	16.4	1.7
-23	16.9	2.2
-22	17.3	2.6
-21	17.8	3.1
-20	18.3	3.6
-19	18.8	4.1
-18	19.3	4.6
-17	19.8	5.1
-16	20.3	5.6
-15	20.9	6.2

Temperature	Pressure
^oF	psia	psig
-14	21.4	6.7
-13	22.0	7.3
-12	22.6	7.9
-11	23.2	8.4
-10	23.7	9.0
-9	24.4	9.6
-8	25.0	10.3
-7	25.6	10.9
-6	26.3	11.6
-5	26.9	12.2
-4	27.6	12.9
-3	28.3	13.6
-2	29.0	14.3
-1	29.7	15.0
0	30.4	15.7
1	31.2	16.5
2	31.9	17.2
3	32.7	18.0
4	33.5	18.8
5	34.3	19.6
6	35.1	20.4
7	35.9	21.2
8	36.8	22.1
9	37.6	22.9
10	38.5	23.8
11	39.4	24.7
12	40.3	25.6
13	41.2	26.5
14	42.2	27.5
15	43.1	28.4
16	44.1	29.4
17	45.1	30.4
18	46.1	31.4
19	47.2	32.5
20	48.2	33.5
21	49.3	34.6
22	50.4	35.7
23	51.5	36.8
24	52.6	37.9
25	53.7	39.0
26	54.9	40.2
27	56.1	41.4
28	57.3	42.6
29	58.5	43.8
30	59.7	45.0

Temperature	Pressure
^oF	psia	psig
76	143.0	128.3
77	145.4	130.7
78	147.9	133.2
79	150.5	135.8
80	153.0	138.3
81	155.6	140.9
82	158.3	143.6
83	161.0	146.3
84	163.7	149.0
85	166.4	151.7
86	169.2	154.5
87	172.0	157.3
88	174.8	160.1
89	177.7	163.0
90	180.6	165.9
91	183.6	168.9
92	186.6	171.9
93	189.6	174.9
94	192.7	178.0
95	195.8	181.1
96	198.9	184.2
97	202.1	187.4
98	205.3	190.6
99	208.6	193.9
100	211.9	197.2
101	215.2	200.5
102	218.6	203.9
103	222.0	207.3
104	225.4	210.7
105	228.9	214.2
106	232.5	217.8
107	236.0	221.3
108	239.7	225.0
109	243.3	228.6
110	247.0	232.3
111	250.8	236.1
112	254.5	239.8
113	258.4	243.7
114	262.2	247.5
115	266.2	251.5
116	270.1	255.4
117	274.1	259.4
118	278.2	263.5
119	282.3	267.6
120	286.4	271.7

Between -60^oF to -28^oF the PSIG pressure values are represented in inches Mercury (vacuum).

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