Saturation tables by temperature and by pressure, superheated vapor table, p–h and T–s diagrams and constants of Helium (He), computed with CoolProp. Any other state of Helium, from any two properties, in the State Explorer or the Worksheet.
By temperature: saturated liquid (f) and saturated vapor (g).
Saturated Helium, by temperature
T °C
Psat kPa
vf m³/kg
vg m³/kg
hf kJ/kg
hfg kJ/kg
hg kJ/kg
sf kJ/(kg·K)
sg kJ/(kg·K)
-270.75
8.3507
0.0068785
0.55514
-6.2368
23
16.763
-1.6626
7.9206
-270.5
13.557
0.006946
0.36772
-5.619
23.304
17.686
-1.4319
7.3622
-270.25
20.638
0.0070387
0.25645
-4.9745
23.483
18.508
-1.2174
6.88
-270
29.888
0.0071542
0.18581
-4.2638
23.484
19.22
-1.0042
6.4509
-269.75
41.599
0.0072943
0.13855
-3.4673
23.274
19.807
-0.78689
6.0585
-269.5
56.063
0.0074637
0.10553
-2.5689
22.82
20.251
-0.56234
5.6898
-269.25
73.578
0.0076711
0.081587
-1.5491
22.076
20.527
-0.32737
5.3332
-269
94.464
0.007931
0.063627
-0.37976
20.973
20.594
-0.077422
4.9764
-268.75
119.08
0.0082704
0.049692
0.98481
19.398
20.383
0.19503
4.6037
-268.5
147.84
0.0087466
0.03845
2.6307
17.136
19.767
0.50451
4.1896
-268.25
181.33
0.0095163
0.028847
4.7632
13.681
18.444
0.88679
3.6788
-268
220.46
0.011518
0.019069
8.4186
6.6159
15.035
1.5316
2.8162
Saturation table by pressure
By pressure: saturated liquid (f) and saturated vapor (g).
Saturated Helium, by pressure
P kPa
Tsat °C
vf m³/kg
vg m³/kg
hf kJ/kg
hfg kJ/kg
hg kJ/kg
sf kJ/(kg·K)
sg kJ/(kg·K)
6
-270.9
0.0068542
0.73454
-6.6366
22.802
16.165
-1.8278
8.3066
7
-270.83
0.0068634
0.64465
-6.4489
22.889
16.44
-1.7486
8.1259
8
-270.77
0.0068744
0.5757
-6.2884
22.972
16.684
-1.6832
7.9704
10
-270.66
0.0068991
0.47643
-6.0165
23.117
17.101
-1.5771
7.7122
15
-270.44
0.0069651
0.3373
-5.476
23.359
17.883
-1.3823
7.2463
20
-270.27
0.0070305
0.26349
-5.0278
23.474
18.447
-1.2343
6.9162
25
-270.12
0.0070939
0.21719
-4.6268
23.507
18.881
-1.1105
6.6588
30
-270
0.0071556
0.1852
-4.2558
23.483
19.227
-1.0019
6.4466
40
-269.78
0.0072754
0.14351
-3.5715
23.313
19.741
-0.81423
6.1058
50
-269.6
0.0073928
0.11727
-2.9372
23.032
20.094
-0.65212
5.8334
60
-269.44
0.0075099
0.099062
-2.3347
22.669
20.335
-0.50672
5.603
70
-269.3
0.0076282
0.085603
-1.7534
22.243
20.489
-0.37301
5.4006
80
-269.17
0.0077491
0.075187
-1.1861
21.76
20.574
-0.24782
5.2175
100
-268.94
0.0080036
0.059983
-0.073297
20.645
20.572
-0.014657
4.8894
150
-268.48
0.0087874
0.037744
2.7589
16.944
19.703
0.52797
4.1584
200
-268.13
0.010171
0.024283
6.1926
11.068
17.26
1.1378
3.3406
Diagrams
p–h diagram of Helium, with isothermsT–s diagram of Helium, with isobars
Superheated vapor table
At each pressure, from its saturated vapor (Sat.) to higher temperatures.
Superheated Helium at 10 kPa (Tsat -270.66 °C)
T °C
v m³/kg
u kJ/kg
h kJ/kg
s kJ/(kg·K)
Sat.
0.47643
12.336
17.101
7.7122
-270.5
0.51322
12.871
18.004
8.0638
-270
0.62464
14.506
20.752
9.0142
-269.5
0.73367
16.118
23.455
9.8106
-269
0.8413
17.716
26.129
10.497
-268.5
0.94804
19.305
28.785
11.102
-268
1.0542
20.887
31.429
11.642
-267.5
1.1599
22.465
34.064
12.13
-267
1.2652
24.039
36.691
12.576
-266.5
1.3704
25.61
39.314
12.986
-266
1.4753
27.18
41.933
13.365
-265.5
1.5802
28.747
44.549
13.719
Superheated Helium at 15 kPa (Tsat -270.44 °C)
T °C
v m³/kg
u kJ/kg
h kJ/kg
s kJ/(kg·K)
Sat.
0.3373
12.823
17.883
7.2463
-270
0.4058
14.314
20.401
8.1083
-269.5
0.48055
15.96
23.168
8.9237
-269
0.55372
17.582
25.887
9.622
-268.5
0.62592
19.188
28.576
10.234
-268
0.69748
20.783
31.245
10.779
-267.5
0.76859
22.371
33.9
11.271
-267
0.83936
23.954
36.544
11.72
-266.5
0.9099
25.532
39.18
12.132
-266
0.98025
27.107
41.811
12.513
-265.5
1.0504
28.68
44.436
12.868
Superheated Helium at 20 kPa (Tsat -270.27 °C)
T °C
v m³/kg
u kJ/kg
h kJ/kg
s kJ/(kg·K)
Sat.
0.26349
13.177
18.447
6.9162
-270
0.29595
14.111
20.03
7.4417
-269.5
0.35376
15.796
22.871
8.2791
-269
0.4098
17.443
25.639
8.9901
-268.5
0.46478
19.068
28.364
9.61
-268
0.51908
20.677
31.059
10.161
-267.5
0.57291
22.276
33.734
10.656
-267
0.62641
23.867
36.395
11.108
-266.5
0.67964
25.453
39.046
11.522
-266
0.73269
27.034
41.688
11.905
-265.5
0.78558
28.612
44.324
12.262
Superheated Helium at 30 kPa (Tsat -270 °C)
T °C
v m³/kg
u kJ/kg
h kJ/kg
s kJ/(kg·K)
Sat.
0.1852
13.671
19.227
6.4466
-269.5
0.22646
15.446
22.239
7.3345
-269
0.2656
17.154
25.123
8.0751
-268.5
0.30349
18.821
27.925
8.713
-268
0.34059
20.461
30.679
9.2754
-267.5
0.37718
22.083
33.398
9.7794
-267
0.4134
23.693
36.095
10.237
-266.5
0.44936
25.293
38.774
10.656
-266
0.4851
26.887
41.44
11.042
-265.5
0.5207
28.476
44.096
11.401
Superheated Helium at 50 kPa (Tsat -269.6 °C)
T °C
v m³/kg
u kJ/kg
h kJ/kg
s kJ/(kg·K)
Sat.
0.11727
14.231
20.094
5.8334
-269.5
0.12291
14.628
20.774
6.0222
-269
0.14943
16.518
23.99
6.8486
-268.5
0.17399
18.293
26.993
7.5322
-268
0.19752
20.007
29.882
8.1226
-267.5
0.22041
21.682
32.703
8.6454
-267
0.24288
23.333
35.477
9.116
-266.5
0.26505
24.967
38.219
9.5446
-266
0.28699
26.587
40.937
9.9387
-265.5
0.30876
28.198
43.636
10.304
Superheated Helium at 100 kPa (Tsat -268.94 °C)
T °C
v m³/kg
u kJ/kg
h kJ/kg
s kJ/(kg·K)
Sat.
0.059983
14.574
20.572
4.8894
-268.5
0.07491
16.68
24.171
5.7041
-268
0.089163
18.708
27.625
6.4103
-267.5
0.10221
20.579
30.8
6.9991
-267
0.11459
22.367
33.826
7.5123
-266.5
0.12655
24.102
36.758
7.9707
-266
0.13823
25.803
39.626
8.3866
-265.5
0.14969
27.479
42.448
8.7682
Superheated Helium at 150 kPa (Tsat -268.48 °C)
T °C
v m³/kg
u kJ/kg
h kJ/kg
s kJ/(kg·K)
Sat.
0.037744
14.042
19.703
4.1584
-268
0.051468
17.026
24.746
5.1912
-267.5
0.062002
19.276
28.576
5.9019
-267
0.071354
21.277
31.98
6.4795
-266.5
0.080091
23.156
35.17
6.9783
-266
0.088445
24.961
38.228
7.4218
-265.5
0.096536
26.718
41.198
7.8234
Enthalpy and entropy are measured from Helium's own reference state (CoolProp's default). The textbooks' refrigerant tables use ASHRAE's: in the Worksheet, write reference ASHRAE.