PRESSURE m STANDARD AmOSPHERE
(Accura. te to .001 nun of Hq, .0001 in. of Hg a.nd .002 of millibar)
Thermal Laler Isothermal Layer
ft.per ft per
Altitude Pressure (!:lb) A1 ti tude (mb)
(feet) (nun Hg) (In. Hq)* (mb) - (feet) {rom Hq)• (Iri.Hq)• (IIlb)
-5,000 907.809 35.7404 1210.312 35,332, 175.899 6•9251 234.513
-4,000 876.533 34.5091 1168.615 36,000 170.375 6. 7077 227.148
-3,000 846.130 33.3121 1128.081 37.000 162.430 6.3949 216.556
-2,000 816.582 32.1488 1088.686 38,000 154.854 6.0966 206.455
-1,000 787.879 31.0188 1050.419 39,000 147.632 5.8123 196.82·6
0 760.000 29.9212 1013.250 27 40,000 140.747 5.5412 187.647 110
1,000 732.923 28.8552 977.150 41,000 134.183 5.28.28 178.896
2,000 706.634 27.8202 942.101 42,000 127.925 5.0364 170.553
3,000 681.114 26.8155 908.077 43,000 121.959 4.8015 162.599
4,000 656.344 25.8403 875.053 44,000 116.271 4.5776 155.015
5,000 632.308 24.8940 843.008 31 45,000 110.848 4.3641 147.785 140
6,000 608.991 23.9760 811.921 46,000 105.678 4.1605 140.892
7,000 586.375 23.0856 181.769 47,000 100.7.50 3.9665 134.322
8,000 564.444 22.2222 752.530 48,000 96.051 3.7815 128.057
9,000 543.180 21.3850 724.180 49,000 -91.5.71 3.6052 122.085
10,000 522.571 20.5736 696.704 36 50,000 87 •.301 3.t.370 116.39~ 175
11,000 502.600 19.7874 670.078 51,000 83.229 3.2767 110.963
12,000 483.251 19.0256 644.282 52,000 79.348 3.1239 105.789
13,000 464.511 18.2878 619.297 53,000 75.647 2.9782 100.854
14,000 446.362 17.5733 595.100 54,000 72.119 2.8393 96.151
15,000 428.793 16.8816 571.677 43 55,000 68.755 2.7069 91.666 225
16,000 411.786 16.2120 549.003 56,000 65.549 2.5807 87.391
17,000 395.332 15.5642 527.066 57,000 62.492 2.4603 83.316
18,000 379.412 14.9375 505.841 58,000 59.577 2.3455 79.429
19,000 364.018 14.3314 485.317 59,000 56.799 2.23€2 75.726
20,000 349.132 13.7453 465.471 50 60,000 54.150 2.1319 72.194 285
21,000 3311.742 13.1788 446.286 61,000 51.62~ 2.0324 68.826
22,000 320.836 12.6313 427.746 62,000 1,9.217 1.9377 65.617
23,000 307.403 12.1025 409.837 63,000 46,921 1.8473 62.556
24,000 294.429 11.5917 392.540 64,000 44,733 1.7611 59.639
25,000 281.901 11.0984 375.837 60 65,000 42.647 1.6790 56.858 360
26,000 269.808 10.6223 359.714 66;000 40.658 1•6007 54.206
27,000 258.140 10.1630 344.158 67,000 38.762 1.5261 51.678
28,000 246.883 9.7198 329.150 68,000 ·36.954 1.4549 'r9.268
29,000 236.027 9.2824 314.677 69,000 35.230 1.3870 46.069
30,000 225.561 8-.8803 300.723 72 70,000 33,587 1.3223 44.779 455
31,000 215.473 8.{832 287.274 71,000 32,021 1.2607 42.691
32,000 205.754 8.1005 274.316 72,000 30,528 1.2019 40.701
33,000 196.394 7.7320 261.837 73,000 29,l04 1.1458 38.802
34,000 187.381 7.3772 249.821 7'i,OOO 27 .7'16 1.0924 36.992
35,000 178.705 7.0353 238.254 86 75,000 2G,452 1.0414 35.266 580
76,000 25.219 .9929 33.623
* }•:ercury co1UITU1 at 0° c. 77,000 24,043 .9466 32,055
(48)