Atmospheric Pressure vs. Elevation above Sea Level
Air pressure above sea level can be calculated as
p = 101325 (1 - 2.25577 10-5 h)5.25588 (1)
where
101325 = normal temperature and pressure at sea level (Pa)
p = air pressure (Pa)
h = altitude above sea level (m)
Example - Air pressure at Elevation 10000 m
The air pressure at altitude 10000 m can be calculated as
p = 101325 (1 - 2.25577 10-5 (10000 m))5.25588
= 26436 Pa
= 26.4 kPa
The table below indicates air pressure at elevations below and above sea level.
| Altitude | Absolute Barometer | Absolute Atmospheric Pressure | ||||
|---|---|---|---|---|---|---|
| feet | metre | inches Hg | mm Hg | psia | kg/cm2 | kPa |
| -5000 | -1524 | 35.7 | 908 | 17.5 | 1.23 | 121 |
| -4500 aprox. deepest point under sea level of Sognefjorden, Norway |
-1372 | 35.1 | 892 | 17.2 | 1.21 | 119 |
| -4000 | -1219 | 34.5 | 876 | 16.9 | 1.19 | 117 |
| -3500 | -1067 | 33.9 | 861 | 16.6 | 1.17 | 115 |
| -3000 | -914 | 33.3 | 846 | 16.4 | 1.15 | 113 |
| -2500 | -762 | 32.7 | 831 | 16.1 | 1.13 | 111 |
| -2000 | -610 | 32.1 | 816 | 15.8 | 1.11 | 109 |
| -1500 The lowest land area on earth - the shore of the Dead Sea, Palestine, Israel and Jordan (-1371 ft) |
-457 | 31.6 | 802 | 15.5 | 1.09 | 107 |
| -1000 | -305 | 31.0 | 788 | 15.2 | 1.07 | 105 |
| -500 | -152 | 30.5 | 774 | 15.0 | 1.05 | 103 |
| 01) | 0 | 29.9 | 760 | 14.7 | 1.03 | 101 |
| 500 aprox. Møllehøj, Denmark |
152 | 29.4 | 746 | 14.4 | 1.01 | 99.5 |
| 1000 | 305 | 28.9 | 733 | 14.2 | 0.997 | 97.7 |
| 1500 | 457 | 28.3 | 720 | 13.9 | 0.979 | 96.0 |
| 2000 | 610 | 27.8 | 707 | 13.7 | 0.961 | 94.2 |
| 2500 | 762 | 27.3 | 694 | 13.4 | 0.943 | 92.5 |
| 3000 | 914 | 26.8 | 681 | 13.2 | 0.926 | 90.8 |
| 3500 | 1067 | 26.3 | 669 | 12.9 | 0.909 | 89.1 |
| 4000 | 1219 | 25.8 | 656 | 12.7 | 0.893 | 87.5 |
| 4500 aprox. Ben Nevis, Scotland, UK |
1372 | 25.4 | 644 | 12.5 | 0.876 | 85.9 |
| 5000 | 1524 | 24.9 | 632 | 12.2 | 0.860 | 84.3 |
| 6000 | 1829 | 24.0 | 609 | 11.8 | 0.828 | 81.2 |
| 7000 | 2134 | 23.1 | 586 | 11.3 | 0.797 | 78.2 |
| 8000 | 2438 | 22.2 | 564 | 10.9 | 0.768 | 75.3 |
| 9000 | 2743 | 21.4 | 543 | 10.5 | 0.739 | 72.4 |
| 10000 | 3048 | 20.6 | 523 | 10.1 | 0.711 | 69.7 |
| 15000 | 4572 | 16.9 | 429 | 8.29 | 0.583 | 57.2 |
| 20000 aprox. Mount McKinley, Alaska, US |
6096 | 13.8 | 349 | 6.75 | 0.475 | 46.6 |
| 25000 | 7620 | 11.1 | 282 | 5.45 | 0.384 | 37.6 |
| 30000 aprox. Mount Everest, Nepal - Tibet |
9144 | 8.89 | 226 | 4.36 | 0.307 | 30.1 |
| 35000 | 10668 | 7.04 | 179 | 3.46 | 0.243 | 23.8 |
| 40000 | 12192 | 5.52 | 140 | 2.71 | 0.191 | 18.7 |
| 45000 | 13716 | 4.28 | 109 | 2.10 | 0.148 | 14.5 |
| 50000 | 15240 | 3.27 | 83 | 1.61 | 0.113 | 11.1 |
1) Sea Level
The pressure below sea level is in a virtual air column or as achieved with an air filled closed pipe connected to the atmosphere.
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