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The table below indicates air pressure at elevations below and above sea level.
Altitude Above Sea Level Absolute Barometer Absolute Atmospheric Pressure
- 3,000 - 915 33.27 845.1 16.34 1.149 112. feet meter inches Hg mm Hg psia kg/cm^2 kPa
- 2,500 - 763 32 .70 830.6 16.06 1.129 110.
- 2,000 - 610 32.14 816.4 15.78 1.109 108.
- 1,500 - 458 31.58 802.1 15.51 1.091 106.
- 1,000 - 305 31.02 787.9 15.23 1.071 105.
- 500 - 153 30.47 773.9 14.96 1.052 103.
- 0 0 29.92 760.0 14.696 1.0333 101.
- 500 153 29.38 746.3 14.43 1.015 99.
- 1,000 305 28.86 733.0 14.16 0.996 97.
- 1,500 458 28.33 719.6 13.91 0.978 95.
- 2,000 610 27.82 706.6 13.66 0.960 94.
- 2,500 763 27.32 693.9 13.41 0.943 92.
- 3,000 915 26.82 681.2 13.17 0.926 90.
- 3,500 1,068 26.33 668.8 12.93 0 .909 89.
- 4,000 1,220 25.84 656.3 12.69 0.892 87.
- 4,500 1,373 25.37 644.4 12.46 0.876 85.
- 5,000 1,526 24.90 632.5 12.23 0.86 84.
- 6,000 1,831 23.99 609.3 11.78 0.828 81.
- 7,000 2,136 23.10 586.7 11.34 0.797 78.
- 8,000 2,441 22.23 564.6 10.91 0.767 75.
- 9,000 2,746 21.39 543.3 10.5 0.738 72.
- 10,000 3,050 20.58 522.7 10.1 0.71 69.
- 15,000 4,577 16.89 429.0 8.29 0.583 57.
- 20,000 6,102 13.76 349.5 6.76 0.475 46.
- 25,000 7,628 11.12 282.4 5.46 0.384 37.
- 30,000 9,153 8.903 226.1 4.37 0.307 30.
- 35,000 10,679 7.06 179.3 3.47 0.244 23.
- 40,000 12,204 5.558 141.2 2.73 0.192 18.
- 45,000 13,730 4.375 111.1 2.15 0.151 14.
- 50,000 15,255 3.444 87.5 1.69 0.119 11.
- 55,000 16,781 2.712 68.9 1.33 0.094 9.
- 60,000 18,306 2.135 54.2 1. 05 0.074 7.
- 70,000 21,357 1.325 33.7 0.65 0.046 4.
- 80,000 24,408 0.8273 21.0 0.41 0.029 2.
- 90,000 27,459 0.520 13.2 0.26 0.018 1.
- 100,000 30,510 0.329 8.36 0.16 0.011 1.
TABLE 1 Changes in Standard Temperature and Pressure (in Hg) as a Function of Altitude (Ref. 1) TABLE 2 Boiling Point as a Function of Barometric Pressure (Ref. 2) Altitude (ft.) Pressure (in. Hg) Boiling pt. ( F) Pressure (in. Hg) Boiling pt. ( F) Boiling pt. [added or reduced] ( F)
- 500 30.466 212.9 27.6 208.04 - 3. 0 29.921 212.0 27.8 208.39 - 3. 500 29.384 211.1 28.0 208.75 - 3. 1000 28.855 210.2 28.2 209.10 - 2. 2000 27.821 208.4 28 .4 209.44 - 2. 2500 27.315 207.5 28.6 209.79 - 2. 3000 26.817 206.6 28.8 210.13 - 1. 3500 26.326 205.7 29.0 210.47 - 1. 4000 25.842 204.8 29.2 210.81 - 1. 4500 25.365 203.9 29.4 211.15 - 0. 5000 24.896 203.0 29.6 211.48 - 0. 5500 24.434 202.0 29.8 211.81 - 0. 6000 23.978 201.1 29.921 212.00 0. 6500 23.530 200.2 30.0 212.14 0. 7000 23.088 199.3 30.2 212.46 0. 7500 22.653 198.3 30.4 212.79 0. 8000 22.225 197.4 30.6 213.11 1. 8500 21.803 196.4 30.8 213.4 3 1. 9000 21.388 195.5 31.0 213.75 1. 9500 20.979 194.6 31.2 214.07 2. 10000 20.577 193.6 31.4 214.38 2. On top of Mount Everest the pressure is about 260 mbar (26.39 kPa) so the boiling point of water is 69 C (156.2 F).