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Barometric Pressure vs. Altitude Table
Altitude Above Sea Level Temperature Barometer Atmospheric Pressure
Feet Miles Meters F C In. Hg.  Abs. mm Hg. Abs. PSI Kg / sq. cm kPa
-5000   -1526 77 25 35.58 903.7 17.48 1.229 120.5
-4500   -1373 75 24 35.00 889.0 17.19 1.209 118.5
-4000   -1220 73 23 34.42 874.3 16.9 1.188 116.5
-3500   -1068 71 22 33.84 859.5 16.62 1.169 114.6
-3000   -915 70 21 33.27 845.1 16.34 1.149 112.7
-2500   -763 68 20 32.70 830.6 16.06 1.129 110.7
-2000   -610 66 19 32.14 816.4 15.78 1.109 108.8
-1500   -458 64 18 31.58 802.1 15.51 1.091 106.9
-1000   -305 63 17 31.02 787.9 15.23 1.071 105.0
-500   -153 61 16 30.47 773.9 14.96 1.052 103.1
0   0 59 15 29.92 760.0 14.696 1.0333 101.33
500   153 57 14 29.38 746.3 14.43 1.015 99.49
1000   305 55 13 28.86 733.0 14.16 0.996 97.63
1500   458 54 12 28.33 719.6 13.91 0.978 95.91
2000   610 52 11 27.82 706.6 13.66 0.960 94.19
2500   763 50 10 27.32 693.9 13.41 0.943 92.46
3000   915 48 9 26.82 681.2 13.17 0.926 90.81
3500   1068 47 8 26.33 668.8 12.93 0.909 89.15
4000   1220 45 7 25.84 656.3 12.69 0.892 87.49
4500   1373 43 6 25.37 644.4 12.46 0.876 85.91
5000 0.95 1526 41 5 24.90 632.5 12.23 0.86 84.33
6000 1.1 1831 38 3 23.99 609.3 11.78 0.828 81.22
7000 1.3 2136 34 1 23.10 586.7 11.34 0.797 78.19
8000 1.5 2441 31 -1 22.23 564.6 10.91 0.767 75.22
9000 1.7 2746 27 -3 21.39 543.3 10.5 0.738 72.40
10,000 1.9 3050 23 -5 20.58 522.7 10.1 0.71 69.64
15,000 2.8 4577 6 -14 16.89 429.0 8.29 0.583 57.16
20,000 3.8 6102 -12 -24 13.76 349.5 6.76 0.475 46.61
25,000 4.7 7628 -30 -34 11.12 282.4 5.46 0.384 37.65
30,000 5.7 9153 -48 -44 8.903 226.1 4.37 0.307 30.13
35,000 6.6 10,679 -66 -54 7.06 179.3 3.47 0.244 23.93
40,000 7.6 12,204 -70 -57 5.558 141.2 2.73 0.192 18.82
45,000 8.5 13,730 -70 -57 4.375 111.1 2.15 0.151 14.82
50,000 9.5 15,255 -70 -57 3.444 87.5 1.69 0.119 11.65
55,000 10.4 16,781 -70 -57 2.712 68.9 1.33 0.0935 9.17
60,000 11.4 18,306 -70 -57 2.135 54.2 1.05 0.0738 7.24
70,000 13.3 21,357 -67 -55 1.325 33.7 0.651 0.651 4.49
80,000 15.2 24,408 -62 -52 0.8273 21.0 0.406 0.406 2.80
90,000 17.1 27,459 -57 -59 0.520 13.2 0.255 0.255 1.76
100,000 18.9 30,510 -51 -46 0.329 8.36 0.162 0.162 1.12

Many of Sable Systems' instruments, such as the OXZILLA II, the FC-10, the PA-10, the CA-10 and the FOXBOX, contain accurate, high resolution barometric pressure sensors that are used for correcting the instruments' readings to a standard pressure of 101.3 kPa. This eliminates drift caused by fluctuations in barometric pressure. The resolution of our sensors is so good (0.1 Pa) that they can easily discern and correct for a pressure change resulting from lifting the instrument a few inches. For calibration, we use our in-house, NIST-traceable ParoScientific pressure standard.

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