# critical Mach number

> lowest Mach number at which the airflow over some point of the aircraft reaches the speed of sound

**Wikidata**: [Q1777346](https://www.wikidata.org/wiki/Q1777346)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Critical_Mach_number)  
**Source**: https://4ort.xyz/entity/critical-mach-number


## References

1. Freebase Data Dumps. 2013