Critical Temperatures and Pressures for Common Substances

Critical temperatures and pressures for common substances like air, alcohol, ether, oxygen and more. This table provides critical temperature, critical pressure, and boiling temperature data for various substances.

Substance	Critical Temperature (°F)	Critical Temperature (°C)	Critical Pressure (psi)	Critical Pressure (bar)	Boiling Temperature (°F)	Boiling Temperature (°C)
Air	-220.94	-140.52	549.08	37.858	-	-
Ammonia (NH3)	270	132.4	1636	112.8	-27.4	-33
Argon	-188	-122	705.6	48.7	-302.5	-185.8
Butane	305.6	152	550.4	38	32	0
Carbon-dioxide (CO2)	87.8	31.2	1071.6	73.8	-110	-79
Carbon-monoxide (CO)	-220.5	-140.3	507.5	35	-310	-190
Chlorine	291	144	1118.7	77.1	-29.3	-34
Decane	653	345	301.7	20.8	345	174
Dowtherm A	-	-	465	32.1	-	-
Ethane	90.0	32.2	708	48.9	-127.4	-88.5
Ethanol (alcohol)	467	242	914	63	173	78.4
Ethylether	381	194	522	36	94.2	34.6
Ethylene	48.9	9.4	735	50.7	-272.6	-169.2
Fluorine	-200	-129	808.5	55.8	-307	-188
Helium	-456	-268	33.2	2.3	-452	-269
Hydrogen (H)	-400	-240	188.2	13.0	-423	-253
Hydrogen Chloride	125	51.6	1198	82.7	-121.1	-85.1
Isobutane	274	135	529.2	36.5	10.9	-11.7
Isobutylene	293	145	580	40.0	19.6	-6.9
Isononane	590	310	335.1	23.1	303	151
Methane	-117	-82.6	673.3	46.5	-259	-162
Nitrogen (N)	-232.6	-147	492.4	34.0	-321	-195
Nitrous Oxide (N2O)	97.4	36.4	1047.6	72.3	-127	-88.5
Oxygen (O2)	-181.5	-118.6	732	50.5	-297	-183
Phosgene	-	-	823.2	56.8	46.9	8.3
Propane	206.1	96.7	617.4	42.6	-44	-42
Propylbenzene	689	365	464.2	32	319	159
Propylene	198	92.4	670.3	46.3	-54	-48
Undecane	691	366	287.2	19.8	385	196
Water	705	374	3206.2	220.5	212	100