Mach 1
1,235 km/hSpeed · definition
Mach depends on sound speed. Here Mach 1 is 343 m/s in dry air at 20 °C.
Speed
Just how fast is Mach 1?
Air & orbit
Mach 1
343 m/smetres per second
1,234.8 km/hkilometres per hour
767.27 mphmiles per hour
1.1441 × 10⁻⁶ cspeed of light
01
Mach 11,235 km/hSpeed · definition
02
Sound in air1,235 km/hSpeed · approximate
Each track shows distance covered in the same second. The small illustrations identify the movers; their sizes are schematic.
A little perspective
Mach 1 and Sound in air have approximately the same speed.
Measurements, assumptions & sources +
Mach 1
Mach depends on sound speed. Here Mach 1 is 343 m/s in dry air at 20 °C.
Sound in air
Approximately 343 m/s in dry air at 20 °C. Mach numbers use this stated local sound speed.
The marked speed is calibrated. Unmeasured illustration details are representative.
Measurement details
Why these numbers?
The visual compares speed with speed. The records below preserve each value’s basis and caveats.
Sound in air
1,235 km/hSpeed · approximate
Approximately 343 m/s in dry air at 20 °C. Mach numbers use this stated local sound speed.
- Comparing
- Speed ↔ Speed
- Relative size
- The two selected measurements are approximately equal.
How to read the visual
The labelled spans and stored measurements determine the scale; unmeasured illustration details do not.
- Sound in air is labelled approximate; treat the displayed value as a comparison anchor rather than false precision.
Change your perspective
Put it next to…
Choose a suggestion to redraw the comparison, or open its page to learn what it is.
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