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COMPRESSIBILITY FACTOR - (Z)
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The values shown for each gas at the specified pressure indicate the relative difference
in compressibility between the theoretical volume that would be calculated from the Ideal Gas
Law and the actual volume of the gas.
The compressibility factors were derived from the Beattie-Bridgeman equation of state for
real gases at 20 degC.
The table values can be used when calculating the partial pressures of a mix as outlined
in the page on mixing.
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| Compressibility of Gases - Z Factor |
| Pressure | Oxygen | Nitrogen | Helium | Air |
| 100 | 0.995 | 0.998 | 1.004 | 0.997 |
| 200 | 0.990 | 0.997 | 1.007 | 0.995 |
| 300 | 0.986 | 0.995 | 1.011 | 0.993 |
| 400 | 0.981 | 0.994 | 1.015 | 0.991 |
| 500 | 0.977 | 0.993 | 1.018 | 0.990 |
| 600 | 0.973 | 0.993 | 1.022 | 0.989 |
| 700 | 0.969 | 0.993 | 1.026 | 0.988 |
| 800 | 0.966 | 0.993 | 1.029 | 0.987 |
| 900 | 0.962 | 0.993 | 1.033 | 0.987 |
| 1000 | 0.959 | 0.994 | 1.036 | 0.986 |
| 1100 | 0.956 | 0.995 | 1.040 | 0.987 |
| 1200 | 0.954 | 0.996 | 1.043 | 0.987 |
| 1300 | 0.951 | 0.997 | 1.047 | 0.988 |
| 1400 | 0.949 | 0.999 | 1.050 | 0.988 |
| 1500 | 0.947 | 1.001 | 1.054 | 0.990 |
| 1600 | 0.945 | 1.003 | 1.057 | 0.991 |
| 1700 | 0.944 | 1.005 | 1.061 | 0.992 |
| 1800 | 0.943 | 1.008 | 1.064 | 0.994 |
| 1900 | 0.942 | 1.011 | 1.067 | 0.996 |
| 2000 | 0.941 | 1.014 | 1.071 | 0.999 |
| 2100 | 0.940 | 1.017 | 1.074 | 1.001 |
| 2200 | 0.940 | 1.021 | 1.078 | 1.004 |
| 2300 | 0.940 | 1.024 | 1.081 | 1.007 |
| 2400 | 0.941 | 1.028 | 1.084 | 1.010 |
| 2500 | 0.941 | 1.032 | 1.088 | 1.013 |
| 2600 | 0.942 | 1.036 | 1.091 | 1.016 |
| 2700 | 0.943 | 1.041 | 1.094 | 1.020 |
| 2800 | 0.944 | 1.045 | 1.097 | 1.024 |
| 2900 | 0.945 | 1.050 | 1.101 | 1.028 |
| 3000 | 0.947 | 1.054 | 1.104 | 1.032 |
| 3100 | 0.948 | 1.059 | 1.107 | 1.036 |
| 3200 | 0.950 | 1.064 | 1.110 | 1.040 |
| 3300 | 0.953 | 1.069 | 1.114 | 1.045 |
| 3400 | 0.955 | 1.074 | 1.117 | 1.049 |
| 3500 | 0.957 | 1.080 | 1.120 | 1.054 |
| 3600 | 0.960 | 1.085 | 1.123 | 1.059 |
| 3700 | 0.963 | 1.091 | 1.127 | 1.064 |
| 3800 | 0.966 | 1.096 | 1.130 | 1.069 |
| 3900 | 0.969 | 1.102 | 1.133 | 1.074 |
| 4000 | 0.972 | 1.107 | 1.136 | 1.079 |
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