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Tu-144, the world's first commercial supersonic aircraft, surpassing Mach 2, goes into service.
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Tupolev Tu-144
Soviet supersonic passenger airliner
The Tupolev Tu-144 is a Soviet supersonic passenger airliner designed by Tupolev in operation from 1968 to 1999.Source: Wikipedia (CC BY-SA)
Supersonic aircraft
Aircraft that travels faster than the speed of sound
A supersonic aircraft is an aircraft capable of supersonic flight, that is, flying faster than the speed of sound. Supersonic aircraft were developed in the second half of the twentieth century. Supersonic aircraft have been used for research and military purposes, but only two…Source: Wikipedia (CC BY-SA)
Mach number
Dimensionless quantity in fluid dynamics
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 Austrian physicist and philosopher Ernst Mach.Source: Wikipedia (CC BY-SA)