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Input interpretation:

altitude | 40000 feet


Standard Atmosphere at 40000 feet altitude:

air mass per unit area above | 1930 kg\/m^2\nbarometric pressure | 188 mbar\nkinetic temperature | -70 °F\ndensity | 0.3 kg\/m^3\nspeed of sound | 574 knots\natmospheric layer | homosphere  (0 to 53 miles)  |  tropopause  (6.6 to 11 miles)\ngravitational acceleration | 32.1 ft\/s^2\n(1976 Standard Atmosphere; values for actual atmosphere vary)


Distance to horizon:

240 miles\n(assuming no obstacles or atmospheric effects)

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