Air pressure at different altitudes
| Altitude(m) | Air pressure(kPa) |
| sea level | 100 |
3000 |
70 |
6000 |
47.5 |
9000 |
32.5 |
Amount of blood and red blood cell count at different altitudes
Altitude (m) |
Blood volume (litres) |
RBC I mm3 blood |
sea level |
5.5 |
5.5 million |
| 1000 | 5.65 |
6 million |
| 3000 | 6.0 | 7.5 million |
| 5000 | 6.25 |
8 million |