Altitude, ft | Barometric pressure, mmHg | Atmospheric PO2, mmHg | Tracheal PO2, mmHg | Gas density* | Gas volume¶ |
0 (sea level) | 760 | 159 | 149 | 1 | 1 |
2000 | 707 | 148 | 138 | - | - |
4000 | 656 | 137 | 128 | 0.9 | 1.1 |
5000 | 632 | 132 | 122 | 0.8 | 1.2 |
8000 | 564 | 118 | 108 | - | 1.4 |
10,000 | 523 | 109 | 100 | 0.7 | 1.5 |
15,000 | 428 | 89 | 80 | 0.6 | 1.9 |
30,000 | 226 | 47 | 38 | 0.3 | 4 |
40,000 | 141 | 29 | 20 | 0.2 | 7.6 |
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