Related Resources: thermodynamics

Critical Thermodynamic Constants in English Units

Thermodynamics
Heat Transfer

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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