Ramjet
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A ramjet is a form of airbreathing jet engine that requires forward motion of the engine to provide air for combustion. Ramjets work most efficiently at supersonic speeds around Mach 3 and can operate up to Mach 6.
An AQM-60 Kingfisher, the first production ramjet to enter service with the US military
Upper engine is a ramjet on the Bloodhound missile
Leduc 010
Bristol Thor ramjet modified for display purposes. Two Thor engines were used on the Bristol Bloodhound missile
Mach number
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The Mach number, often only Mach, is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound.
It is named after the Czech physicist and philosopher Ernst Mach.
An F/A-18 Hornet creating a vapor cone at transonic speed just before reaching the speed of sound