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What (who) is hypersonics - definition
SPEED THAT IS FASTER THAN MACH 5
Hypersonic flow; High-hypersonic speed regime; User:NimblyPimbly; Hypersonics; Hypersonic velocity; Hypersonic; Hypersound; Mach 10 (speed); Mach 6 (speed)
 Mach 7 computational fluid dynamic (CFD).jpg?width=200)
hypersonic
¦ adjective
1. relating to speeds of more than five times the speed of sound (Mach 5).
2. relating to sound frequencies above about a thousand million hertz.
Derivatives
hypersonically adverb
Hypersonic speed
In aerodynamics, a hypersonic speed is one that exceeds 5 times the speed of sound, often stated as starting at speeds of Mach 5 and above.
Hypersonic flight
![Hermeus corporation]] in flight.](https://commons.wikimedia.org/wiki/Special:FilePath/Hermeus Halcyon depiction.png?width=200 "Hermeus corporation]] in flight.")
![JADC2]] ([[Joint all-domain command and control]])''}}](https://commons.wikimedia.org/wiki/Special:FilePath/HypersonicFlight.jpg?width=200 "JADC2]] ([[Joint all-domain command and control]])''}}")
FLIGHT BELOW 90 KILOMETRES AT SPEEDS ABOVE MACH 5
Hypersonic transportation; Hypersonic aircraft; Hypersonic weapon development; Hypersonic research; Hypercruise
Hypersonic flight is flight through the atmosphere below altitudes of about 90 km at speeds greater than Mach 5, a speed where dissociation of air begins to become significant and high heat loads exist. Speeds of Mach 25+ have been achieved below the thermosphere as of 2020.
Wikipedia
Hypersonic speed
 Mach 7 computational fluid dynamic (CFD).jpg?width=120)
In aerodynamics, a hypersonic speed is one that exceeds five times the speed of sound, often stated as starting at speeds of Mach 5 and above.
The precise Mach number at which a craft can be said to be flying at hypersonic speed varies, since individual physical changes in the airflow (like molecular dissociation and ionization) occur at different speeds; these effects collectively become important around Mach 5-10. The hypersonic regime can also be alternatively defined as speeds where specific heat capacity changes with the temperature of the flow as kinetic energy of the moving object is converted into heat.
