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AeroCalc
Velocity divided by the speed of sound — the number that defines flight regimes.
Subsonic (Mach < 0.8) is normal commercial aviation; transonic (0.8–1.2) is where shockwaves first form and aerodynamics get tricky; supersonic (1.2–5.0) is Concorde and fighter jets; hypersonic (> 5.0) is re-entry vehicles and experimental scramjets. Each regime requires fundamentally different engineering.
The speed of sound depends on temperature — at sea level (15°C) it's about 343 m/s, but at 35,000 ft (-56°C) it drops to about 295 m/s. This means the same aircraft velocity corresponds to a higher Mach number at altitude, which is why jets measure airspeed in Mach rather than km/h.
Mach number
1.983
Ma = v / c
What you entered
Mach number: Ma = v / c
680 / 343= 1.9825Flight regime
Ma = 1.9825= SupersonicResult
Mach number: 1.983
At 680 m/s (2,448 km/h), Mach 1.983 — supersonic flight.