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Hypersonic

In aerodynamics, a hypersonic speed is one that is highly supersonic. since the 1970s, the term has generally been assumed to refer to 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. the hypersonic regime is often alternatively defined as speeds where ramjets do not produce net thrust.