Airport Engineering
According to I.C.A.O. the recommended length of air ports is decided on

Sea level elevation
Effective gradient percentage
All listed here
Standard sea level temperature (15°C)

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Airport Engineering
Speed of

Sound varies 2.4 kmph per degree centigrade rise in temperature
All listed here
Sound at 0°C is 1190 kmph
Sound at 0°C is called one Mach

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