Airport Engineering
As per ICAO recommendation, the rate of change of longitudinal gradient per 30 m length of vertical curve for A and B type of airports is limited to a maximum of

0.003
0.002
0.001
0.004

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Airport Engineering
Speed of

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

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