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Mach number is the ratio of object speed to local sound speed. It determines aerodynamic behavior: subsonic (M<1), transonic (M≈1), or supersonic (M>1).
公式
The calculator applies M = v / v_sound
- M
- v / v_sound — v / v_sound
ステップバイステップガイド
- 1Enter object velocity and local sound speed
- 2The calculator applies M = v / v_sound
- 3Results show flight regime and aerodynamic characteristics
解いた例
入力
v = 340 m/s (aircraft), v_sound = 340 m/s (sea level)
結果
M = 1.0 (transonic, breaking sound barrier)
Speed of sound varies with temperature
避けるべきよくある間違い
- ✕Using ground temperature instead of local air temperature
- ✕Forgetting that sound speed changes with altitude and temperature
よくある質問
Why is speed of sound important?
Below Mach 1, air flows smoothly. Above it, shock waves form, dramatically increasing drag and heat.
What is the sound barrier?
It's not a physical barrier; at Mach 1, aerodynamic changes are dramatic. Experienced pilots can exceed it safely.
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