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Aircraft Propulsion, 2nd Edition by Saeed Farokhi

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APPENDIX A U.S. Standard Atmosphere

U.S. Standard Atmosphere U.S. Units

In this table alt is altitude in thousands of feet.

sigma is density divided by sea-level density.

delta is pressure divided by sea-level pressure.

theta is temperature divided by sea-level temperature.

temp is temperature in degrees Rankine.

press is pressure in pounds per square foot.

dens is density in slugs per cubic foot.

a is the speed of sound in feet per second.

visc is viscosity in 10−6 slugs per foot-second.

k.visc is kinematic viscosity in 10−6 square feet per second.

ratio is speed of sound divided by kinematic viscosity times 106.

Sea-level density = 0.0023769 slugs per cubic foot

Sea-level temperature = 518.7 degree Rankine

Sea-level pressure = 2116.2 pounds per square foot

alt sigma delta theta temp press dens a visc k.visc ratio
−1 1.0296 1.0367 1.0069 522.2 2193.8 0.0024472 1120.3 0.376 1.54E–4 7.30
  0 1.0000 1.0000 1.0000 518.7 2116.2 0.0023769 1116.5 0.374 1.57E–4 7.10
  1 0.9711 0.9644 0.9931 515.1 2040.9 0.0023081 1112.6 0.372 1.61E–4 6.91
  2 0.9428 0.9298 0.9863 511.5 1967.7 0.0022409 1108.7 0.370 1.65E–4 6.72
  3 0.9151 0.8963 0.9794 508.0 1896.7 0.0021752 1104.9 0.368 1.69E–4 6.54
  4 0.8881 0.8637 0.9725 504.4 1827.7 0.0021109 1101.0 0.366 1.73E–4 6.36
  5 0.8617 0.8321 0.9656 500.8 1760.9 0.0020482 1097.1 0.364 1.78E–4 6.18
  6 0.8359 0.8014 0.9588 497.3 1696.0 0.0019869 1093.2 0.362 1.82E–4 6.01
  7 0.8107 0.7717 0.9519 493.7 1633.1 0.0019270 1089.3

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