Related Clues:
- Supersonic speed unit
- __ one (speed of sound)
- Jet speed category
- Eighth-century pope
- Speed-of-sound name
- The speed of sound is ... one
- Ratio to the speed of sound
- Jet-speed word
- Ratio of the speed of a moving body to the speed of sound
- Eponymous physicist Ernst __
- Physicist Ernst who studied shock waves
- Airspeed ratio
- Endeavor speed measurement
- Number referring to speed of sound
- Ratio of a body's speed to the speed of sound