Related Resources: thermodynamics
Critical Thermodynamic Constants in English Units
Critical Thermodynamic Constants (English Units) Chemical formula, Molecular Mass, Temperature in Rankin, Pressure in psi and Volume
|
Substance
|
Formula
|
Molecular
Mass |
Temp
(R) |
Pressure
(lbf/in2) |
Volume
(ft3/lbm) |
|
Ammonia
|
NH3
|
17.031
|
729.9
|
1646
|
0.0682
|
|
Argon
|
AR
|
39.948
|
271.4
|
706
|
0.0300
|
|
Bromine
|
Br2
|
159.808
|
1058.4
|
1494
|
0.0127
|
|
Carbon dioxide
|
CO2
|
44.010
|
547.4
|
1070
|
0.0342
|
|
Carbon monoxide
|
CO
|
28.010
|
239.2
|
508
|
0.0533
|
|
Chlorine
|
Cl2
|
70.906
|
750.4
|
1157
|
0.0280
|
|
Fluorine
|
F2
|
37.997
|
259.7
|
757
|
0.0279
|
|
Helium
|
He
|
4.003
|
9.34
|
32.9
|
0.2300
|
|
Hydrogen (normal)
|
H2
|
2.016
|
59.76
|
188.6
|
0.5170
|
|
Krypton
|
Kr
|
83.800
|
376.9
|
798
|
0.0174
|
|
Neon
|
Ne
|
20.183
|
79.92
|
400
|
0.0330
|
|
Nitric oxide
|
NO
|
30.006
|
324.0
|
940
|
0.0308
|
|
Nitrogen
|
N2
|
28.013
|
227.2
|
492
|
0.0514
|
|
Nitrogen dioxide
|
NO2
|
46.006
|
775.8
|
1465
|
0.0584
|
|
Nitrous oxide
|
N2O
|
44.013
|
557.3
|
1050
|
0.0354
|
|
Oxygen
|
O2
|
31.999
|
278.3
|
731
|
0.0367
|
|
Sulfur dioxide
|
SO2
|
64.063
|
775.4
|
1143
|
0.0306
|
|
Water
|
H2O
|
18.015
|
1165.1
|
3208
|
0.0508
|
|
Xenon
|
Xe
|
131.300
|
521.5
|
847
|
0.0144
|
|
Acetylene
|
C2H2
|
26.038
|
554.9
|
891
|
0.0693
|
|
Benzene
|
C6H6
|
78.114
|
1012.0
|
709
|
0.0531
|
|
n-Butane
|
C4H10
|
58.124
|
765.4
|
551
|
0.0703
|
|
Chlorodifluoroethane (142b)
|
CH3CClF2
|
100.495
|
738.5
|
616
|
0.0368
|
|
Chlorodifluoromethane (22)
|
CHClF2
|
86.469
|
664.7
|
721
|
0.0307
|
|
Dichlorodifluoroethane (141)
|
CH3CCl2F
|
116.950
|
866.7
|
658
|
0.0345
|
|
Dichlorotrifluoroethane (123)
|
CHCl2CF3
|
152.930
|
822.4
|
532
|
0.0291
|
|
Difluoroethane (152a)
|
CHF2CH3
|
66.050
|
695.5
|
656
|
0.0435
|
|
Difluoromethane (32)
|
CH2F2
|
52.024
|
632.3
|
838
|
0.0378
|
|
Ethane
|
C2H6
|
30.070
|
549.7
|
708
|
0.0790
|
|
Ethyl alcohol
|
C2H5OH
|
46.069
|
925.0
|
891
|
0.0581
|
|
Ethylene
|
C2H4
|
28.054
|
508.3
|
731
|
0.0744
|
|
n-Heptane
|
C7H16
|
100.205
|
972.5
|
397
|
0.0691
|
|
n-Hexane
|
C6H14
|
86.178
|
913.5
|
437
|
0.0688
|
|
Methane
|
CH4
|
16.043
|
342.7
|
667
|
|
|
Methyl alcohol
|
CH3OH
|
32.042
|
922.7
|
1173
|
0.0590
|
|
n-Octane
|
C8H18
|
114.232
|
1023.8
|
361
|
0.0690
|
|
Pentafluoroethane (125)
|
CHF2CF3
|
120.022
|
610.6
|
525
|
0.0282
|
|
n-Pentane
|
C5H12
|
72.151
|
845.5
|
489
|
0.0675
|
|
Propane
|
C3H8
|
44.094
|
665.6
|
616
|
0.0964
|
|
Propene
|
C3H8
|
42.081
|
656.8
|
667
|
0.0689
|
|
Refrigerant mixture
|
R-410a
|
72.585
|
620.1
|
711
|
0.0349
|
|
Tetrafluoroethane (134a)
|
CF3CH2 F
|
102.030
|
673.6
|
589
|
0.0311
|
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