{glossarbot=disable} Critical point- Critical Point of the Elements from READE
|
ref
|
Tc(K)
|
Tc(°C)
|
Pc(MPa)
|
Pc(other)
|
Vc(cm³/mol)
|
ρc(g/cm³)
|
|
1 H hydrogen
|
|
use
|
32.97
|
-240.18
|
1.293
|
|
|
|
|
CRC.a
|
32.97
|
-240.18
|
1.293
|
|
65
|
|
|
KAL
|
33.2
|
|
1.297
|
|
65.0
|
|
|
SMI
|
|
-239.9
|
|
13.2 kg/cm²
|
|
0.0310
|
|
1 H hydrogen (equilibrium)
|
|
LNG
|
|
-240.17
|
1.294
|
12.77 atm
|
65.4
|
0.0308
|
|
1 H hydrogen (normal)
|
|
LNG
|
|
-239.91
|
1.297
|
12.8 atm
|
65.0
|
0.0310
|
|
1 H hydrogen-2
|
|
KAL
|
38.2
|
|
1.65
|
|
60
|
|
|
1 H hydrogen-2 (equilibrium)
|
|
LNG
|
|
-234.8
|
1.650
|
16.28
|
60.4
|
0.0668
|
|
1 H hydrogen-2 (normal)
|
|
LNG
|
|
-234.7
|
1.665
|
16.43
|
60.3
|
0.0669
|
|
2 He helium
|
|
use
|
5.19
|
-267.96
|
0.227
|
|
|
|
|
CRC.a
|
5.19
|
-267.96
|
0.227
|
|
57
|
|
|
KAL
|
5.19
|
|
0.227
|
|
57.2
|
|
|
SMI
|
|
-267.9
|
|
2.34 kg/cm²
|
|
0.0693
|
|
2 He helium (equilibrium)
|
|
LNG
|
|
-267.96
|
0.2289
|
2.261 atm
|
|
0.06930
|
|
2 He helium-3
|
|
LNG
|
|
-269.85
|
0.1182
|
1.13 atm
|
72.5
|
0.0414
|
|
2 He helium-4
|
|
LNG
|
|
-267.96
|
0.227
|
2.24 atm
|
57.3
|
0.0698
|
|
3 Li lithium
|
|
use
|
(3223)
|
(2950)
|
(67)
|
|
|
|
|
CRC.b
|
(3223)
|
2950
|
(67)
|
|
(66)
|
|
|
7 N nitrogen
|
|
use
|
126.21
|
-146.94
|
3.39
|
|
|
|
|
CRC.a
|
126.21
|
-146.94
|
3.39
|
|
90
|
|
|
KAL
|
126.2
|
|
3.39
|
|
89.5
|
|
|
SMI
|
|
-147.1
|
|
34.7 kg/cm²
|
|
0.3110
|
|
7 N nitrogen-14
|
|
LNG
|
|
-146.94
|
3.39
|
33.5 atm
|
89.5
|
0.313
|
|
7 N nitrogen-15
|
|
LNG
|
|
-146.8
|
3.39
|
33.5 atm
|
90.4
|
0.332
|
|
8 O oxygen
|
|
use
|
154.59
|
-118.56
|
5.043
|
|
|
|
|
CRC.a
|
154.59
|
-118.56
|
5.043
|
|
73
|
|
|
LNG
|
|
-118.56
|
5.043
|
49.77 atm
|
73.4
|
0.436
|
|
KAL
|
154.6
|
|
5.04
|
|
73.4
|
|
|
SMI
|
|
-118.8
|
|
51.4 kg/cm²
|
|
0.430
|
|
9 F fluorine
|
|
use
|
144.13
|
-129.02
|
5.172
|
|
|
|
|
CRC.a
|
144.13
|
-129.02
|
5.172
|
|
66
|
|
|
LNG
|
|
-129.0
|
5.215
|
51.47 atm
|
66.2
|
0.574
|
|
KAL
|
144.3
|
|
5.22
|
|
66
|
|
|
10 Ne neon
|
|
use
|
44.4
|
-228.7
|
2.76
|
|
|
|
|
CRC.a
|
44.4
|
-228.7
|
2.76
|
|
42
|
|
|
LNG
|
|
-228.71
|
2.77
|
27.2 atm
|
41.7
|
0.4835
|
|
KAL
|
44.4
|
|
2.76
|
|
41.7
|
|
|
SMI
|
|
-228.7
|
|
26.8 kg/cm²
|
|
0.484
|
|
11 Na sodium
|
|
use
|
(2573)
|
(2300)
|
(35)
|
|
|
|
|
CRC.b
|
(2573)
|
2300
|
(35)
|
|
(116)
|
|
|
15 P phosphorus
|
|
use
|
994
|
721
|
|
|
|
|
|
CRC.a
|
994
|
721
|
|
|
|
|
|
LNG
|
|
721
|
|
|
|
|
|
16 S sulfur
|
|
use
|
1314
|
1041
|
20.7
|
|
|
|
|
CRC.a
|
1314
|
1041
|
20.7
|
|
|
|
|
LNG
|
|
1041
|
11.7
|
116 atm
|
|
|
|
KAL
|
1314
|
|
20.7
|
|
|
|
|
SMI
|
|
1040
|
|
|
|
|
|
17 Cl chlorine
|
|
use
|
416.9
|
143.8
|
7.991
|
|
|
|
|
CRC.a
|
416.9
|
143.8
|
7.991
|
|
123
|
|
|
LNG
|
|
143.8
|
7.71
|
76.1 atm
|
124
|
0.573
|
|
KAL
|
416.9
|
|
7.98
|
|
124
|
|
|
SMI
|
|
144.0
|
|
78.7 kg/cm²
|
|
0.573
|
|
18 Ar argon
|
|
use
|
150.87
|
-122.28
|
4.898
|
|
|
|
|
CRC.a
|
150.87
|
-122.28
|
4.898
|
|
75
|
|
|
LNG
|
|
-122.3
|
4.87
|
48.1 atm
|
74.6
|
0.536
|
|
KAL
|
150.9
|
|
4.90
|
|
74.6
|
|
|
SMI
|
|
-122
|
|
49.7 kg/cm²
|
|
0.531
|
|
19 K potassium
|
|
use
|
(2223)
|
(1950)
|
(16)
|
|
|
|
|
CRC.b
|
(2223)
|
1950
|
(16)
|
|
(209)
|
|
|
33 As arsenic
|
|
use
|
1673
|
1400
|
|
|
|
|
|
CRC.a
|
1673
|
1400
|
|
|
35
|
|
|
LNG
|
|
1400
|
|
|
|
|
|
34 Se selenium
|
|
use
|
1766
|
1493
|
27.2
|
|
|
|
|
CRC.a
|
1766
|
1493
|
27.2
|
|
|
|
|
LNG
|
|
1493
|
|
|
|
|
|
35 Br bromine
|
|
use
|
588
|
315
|
10.34
|
|
|
|
|
CRC.a
|
588
|
315
|
10.34
|
|
127
|
|
|
LNG
|
|
315
|
10.3
|
102 atm
|
135
|
1.184
|
|
KAL
|
588
|
|
10.3
|
|
127
|
|
|
SMI
|
|
302
|
|
|
|
1.18
|
|
36 Kr krypton
|
|
use
|
209.41
|
-63.74
|
5.50
|
|
|
|
|
CRC.a
|
209.41
|
-63.74
|
5.50
|
|
91
|
|
|
LNG
|
|
-63.75
|
5.50
|
54.3 atm
|
91.2
|
0.9085
|
|
KAL
|
209.4
|
|
5.50
|
|
91.2
|
|
|
37 Rb rubidium
|
|
use
|
(2093)
|
(1820)
|
(16)
|
|
|
|
|
CRC.b
|
(2093)
|
1820
|
(16)
|
|
(247)
|
|
|
LNG
|
|
1832
|
|
|
250
|
0.34
|
|
53 I iodine
|
|
use
|
819
|
546
|
11.7
|
|
|
|
|
CRC.a
|
819
|
546
|
|
|
155
|
|
|
LNG
|
|
546
|
11.7
|
115 atm
|
155
|
0.164
|
|
KAL
|
819
|
|
|
|
155
|
|
|
SMI
|
|
553
|
|
|
|
|
|
54 Xe xenon
|
|
use
|
289.77
|
16.62
|
5.841
|
|
|
|
|
CRC.c
|
289.77
|
16.62
|
5.841
|
|
118
|
|
|
LNG
|
|
16.583
|
5.84
|
57.64 atm
|
118
|
1.105
|
|
KAL
|
289.7
|
|
5.84
|
|
118
|
|
|
SMI
|
|
16.6
|
|
60.2 kg/cm²
|
|
1.155
|
|
55 Cs caesium
|
|
use
|
1938
|
1665
|
9.4
|
|
|
|
|
CRC.d
|
1938
|
1665
|
9.4
|
|
341
|
|
|
LNG
|
|
1806
|
|
|
300
|
0.44
|
|
80 Hg mercury
|
|
use
|
1750
|
1477
|
172.00
|
|
|
|
|
CRC.a
|
1750
|
1477
|
172.00
|
|
43
|
|
|
LNG
|
|
1477
|
160.8
|
1587 atm
|
|
|
|
KAL
|
1750
|
|
172
|
|
42.7
|
|
|
SMI
|
|
1460±20
|
|
1640±50 kg/cm²
|
|
0.5
|
|
86 Rn radon
|
|
use
|
377
|
104
|
6.28
|
|
|
|
|
CRC.a
|
377
|
104
|
6.28
|
|
|
|
|
LNG
|
|
104
|
6.28
|
62 atm
|
139
|
1.6
|
|
KAL
|
377
|
|
6.3
|
|
|
|
|
SMI
|
|
104
|
|
64.1 kg/cm²
|
|
|
References:
a) CRC.a-d
David R. Lide (ed), CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida, 2003; Section 6, Fluid Properties; Critical Constants. Also agrees with Celsius values from Section 4: Properties of the Elements and Inorganic Compounds, Melting, Boiling, Triple, and Critical Point Temperatures of the Elements
-
Estimated accuracy for Tc and Pc is indicated by the number of digits. Above 750 K Tc values may be in error by 10 K or more. Vc values are not assumed accurate more than to a few percent. Parentheses indicate extrapolated values. From these sources:
-
(a) D. Ambrose, Vapor-Liquid Constants of Fluids, in R.M. Stevenson, S. Malanowski, Handbook of the Thermodynamics of Organic Compounds, Elsevier, New York, (1987).
-
(b) I.G. Dillon, P.A. Nelson, B.S. Swanson, J. Chem. Phys. 44, 4229, (1966).
-
(c) O. Sifner, J. Klomfar, J. Phys. Chem. Ref. Data 23, 63, (1994).
-
(d) N.B. Vargaftik, Int. J. Thermophys. 11, 467, (1990).
b) LNG-
J.A. Dean (ed), Lange's Handbook of Chemistry (15th Edition), McGraw-Hill, 1999; Section 6; Table 6.5 Critical Properties
c) KAL-
National Physical Laboratory, Kaye and Laby Tables of Physical and Chemical Constants; D. Ambrose, M.B. Ewing, M.L. McGlashan, Critical constants and second virial coefficients of gases (retrieved Dec 2005)
d) SMI-
W.E. Forsythe (ed.), Smithsonian Physical Tables 9th ed., online version (1954; Knovel 2003). Table 259, Critical Temperatures, Pressures, and Densities of Gases
|
