Mach number

Show Summary Details

Quick Reference

The ratio between the speed of a body immersed in a fluid to that of the speed of sound in the surrounding fluid. When the Mach number exceeds 1, the speed is supersonic, and when above 5, it is hypersonic.

Subjects: Astronomy and Astrophysics.

Reference entries

See all related reference entries in Oxford Index »

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.