Compressibility factor for air Z

Pressure Vessel Engineering and Design
Fluids Design and Engineering

Compressibility factor for air Z

Temp, K
Pressure, bar (absolute)
1
5
6
10
20
40
60
80
100
150
181.19
200
250
300
Pressure, psia
14.5

72.52

87.02
145.04
290.18
580.15
870.23
1160.3
1450.38
2175.57
2627.94
2900.75
3625.94
4351.13
75
0.0052
0.0260
0.0519
0.1036
0.2063
0.3082
0.4094
0.5099
0.7581
1.0125
-
-
-
-
80
-
0.0250
0.0499
0.0995
0.1981
0.2958
0.3927
0.4887
0.7258
0.9588
1.1931
1.4139
-
-
90
0.9764
0.0236
0.0453
0.0940
0.1866
0.2781
0.3686
0.4681
0.6779
0.8929
1.1098
1.3110
1.7161
2.1105
100
0.9797
0.8872
0.0453
0.0900
0.1782
0.2635
0.3498
0.4337
0.6386
0.8377
1.0395
1.2227
1.5937
1.9536
120
0.9880
0.9373
0.8860
0.6730
0.1778
0.2557
0.3371
0.4132
0.5964
0.7720
0.9530
1.1076
1.5091
1.7366
140
0.9927
0.9614
0.9205
0.8297
0.5856
0.3313
0.3737
0.4340
0.5909
0.7699
0.9114
1.0393
1.3202
1.5903
160
0.9951
0.9748
0.9489
0.8954
0.7803
0.6603
0.5696
0.5489
0.6340
0.7564
0.8840
1.0105
1.2585
1.4970
180
0.9967
0.9832
0.9660
0.9314
0.8625
0.7977
0.7432
0.7084
0.7180
0.7986
0.9000
1.0068
1.2232
1.4361
200
0.9978
0.9886
0.9767
0.9539
0.9100
0.8701
0.8374
0.8142
0.8061
0.8549
0.9311
1.0185
1.2054
1.3944
250
0.9992
0.9957
0.9911
0.9822
0.9671
0.9549
0.9463
0.9411
0.9450
0.9713
1.0152
1.0702
1.1990
1.3392
300
0.9999
0.9987
0.9974
0.9950
0.9917
0.9901
0.9903
0.9930
1.0074
1.0326
1.0669
1.1089
1.2073
1.3163
350
1.0000
1.0002
1.0004
1.0014
1.0038
1.0075
1.0121
1.0183
1.0377
1.0635
1.0947
1.1303
1.2116
1.3015
400
1.0002
1.0012
1.0025
1.0046
1.0100
1.0159
1.0229
1.0312
1.0533
1.0795
1.1087
1.1411
1.2117
1.2890
450
1.0003
1.0016
1.0034
1.0063
1.0133
1.0210
1.0287
1.0374
1.0614
1.0913
1.1183
1.1463
1.2090
1.2778
500
1.0003
1.0020
1.0034
1.0074
1.0151
1.0234
1.0323
1.0410
1.0650
1.0913
1.1183
1.1463
1.2051
1.2667
600
1.0004
1.0022
1.0039
1.0081
1.0164
1.0253
1.0340
1.0434
1.0678
1.0920
1.1172
1.1427
1.1947
1.2475
800
1.0004
1.0020
1.0038
1.0077
1.0157
1.0240
1.0321
1.0408
1.0621
1.0844
1.1061
1.1283
1.1720
1.2150
1000
1.0004
1.0018
1.0037
1.0068
1.0142
1.0215
1.0290
1.0365
1.0556
1.0744
1.0948
1.1131
1.1515
1.1889

Z values are calculated from values of pressure, volume (or density), and temperature in Vassernan, Kazavchinskii, and Rabinovich, "Thermophysical Properties of Air and Air Components;' Moscow, Nauka, 1966, and NBS-NSF Trans. TT 70-50095, 1971: and Vassernan and Rabinovich, "Thermophysical Properties of Liquid Air and Its Component, "Moscow, 1968, and NBS-NSF Trans. 69-55092, 1970.

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