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What (who) is hypersonic - 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 weapon
![Air-Launched Rapid Response Weapon]] (Arrow) carried by a B-52 bomber](https://commons.wikimedia.org/wiki/Special:FilePath/AGM-183A ARRW on a B-52, June 2019 (190612-F-HP195-0014) (cropped).jpg?width=200 "Air-Launched Rapid Response Weapon]] (Arrow) carried by a B-52 bomber")
CLASS OF WEAPON
Hypersonic missile; List of hypersonic weapons; Hypersonic weapons
Hypersonic weapons are missiles and projectiles which travel at between 5 and 25 times the speed of sound – about 1 to 5 miles per second (1.6 to 8 kilometres per second).
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.
Examples of use of hypersonic
1. It eventually would be able to boost the hypersonic vehicle into space.
2. Most analysts viewed the earlier announcements about "hypersonic" missile systems as Moscow‘s response to U.S. missile defense plans.
3. But the panel added that technology development of longer–term delivery options, such as hypersonic cruise missiles, though technically risky "could provide some advantages" to sub–launched missiles.
4. They are hypersonic and capable of changing their flight path." Putin said the new missiles were capable of carrying nuclear warheads.
5. A top secret, hypersonic, cold war spy plane that was allegedly flown by the Americans in UK airspace without the government‘s permission.