Convert Mach 1 to Speed of Light
Convert Mach 1 (Ma) to Speed of Light (c) instantly and accurately.
Conversion Formula
c = Ma × 1.135085260e-6
About Mach 1
Mach 1 = the speed of sound in dry air at ISA sea-level (15°C, 101.325 kPa) = exactly 340.29 m/s (1,225 km/h; 761 mph). Chuck Yeager first exceeded it on 14 October 1947 in the Bell X-1. At 35,000 ft cruise altitude (−56.5°C), it falls to 295.1 m/s. Flight regimes: subsonic
About Speed of Light
The speed of light in vacuum (c) = exactly 299,792,458 m/s - the defined SI constant from which the metre is derived (since 1983) and the universal speed limit of causality. Light from the Sun reaches Earth in 8 min 20 s; from the Moon in 1.28 s; from Proxima Centauri in 4.24 years. Mars communication delay 3-22 minutes. In optical fibre (n ≈ 1.467), c/n ≈ 200,000 km/s. GPS clocks must correct for both special and general relativistic effects. c = 299,792,458 m/s.
Quick Reference Table
| Mach 1 (Ma) | Speed of Light (c) |
|---|---|
| 1 Ma | 1.135 × 10-6 c |
| 2 Ma | 2.27 × 10-6 c |
| 5 Ma | 5.675 × 10-6 c |
| 10 Ma | 1.135 × 10-5 c |
| 25 Ma | 2.838 × 10-5 c |
| 50 Ma | 5.675 × 10-5 c |
| 100 Ma | 0.000113509 c |