Convert Kilometres per Second to Mach 20
Convert Kilometres per Second (km/s) to Mach 20 (Ma20) instantly and accurately.
Conversion Formula
Ma20 = km/s × 0.1469334979
About Kilometres per Second
A kilometre per second (km/s) = 1,000 m/s - the scale of orbital mechanics and hypervelocity. ISS orbital speed ≈ 7.66 km/s; Earth escape velocity 11.186 km/s. Voyager 1 travels ~17 km/s relative to the Sun. Meteoroids enter Earth's atmosphere at 11-72 km/s; solar wind 400-800 km/s. High-explosive detonation fronts propagate at 6.9-8.8 km/s. 1 km/s = 3,600 km/h = 2,236.9 mph.
About Mach 20
Mach 20 ≈ 6,805.8 m/s (24,501 km/h) at ISA sea level - the peak heating regime of ballistic re-entry. Shock layer temperature exceeds 10,000 K; plasma sheath causes radio blackout. Space Shuttle decelerated through Mach 20 at ~75-80 km altitude; Apollo CM hit the atmosphere at ~Mach 36; ICBM warheads re-enter at Mach 18-24. DARPA HTV-2 reached Mach 20 in 2011. 1 Mach 20 = 6,805.8 m/s.
Quick Reference Table
| Kilometres per Second (km/s) | Mach 20 (Ma20) |
|---|---|
| 1 km/s | 0.146933 Ma20 |
| 2 km/s | 0.293867 Ma20 |
| 5 km/s | 0.734667 Ma20 |
| 10 km/s | 1.46933 Ma20 |
| 25 km/s | 3.67334 Ma20 |
| 50 km/s | 7.34667 Ma20 |
| 100 km/s | 14.6933 Ma20 |