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In aerodynamics, the sound barrier is the apparent physical boundary stopping large objects from becoming supersonic. The term came into use during World War II when a number of aircraft started to encounter the effects of compressibility, a grab-bag of unrelated aerodynamic effects, and fell out of use in the 1950s when aircraft started to routinely "break" the sound barrier.
As a plane approaches the speed of sound, the way air flows around its surfaces changes and it becomes a compressible fluid. Along with a number of changes in the way that lift is generated, this change also gives rise to a rapid increase in drag, known as the wave drag.
At first the exact nature of the wave drag was not well understood. It appeared that it increased exponentially, as it does for a limited range of speeds. With only the limited power of piston engines to drive them, planes could not overcome this rapid increase in drag, and even large increases in power would result in only tiny increases in performance. It appeared that an infinite amount of power would be needed to reach supersonic speeds, and thus everyone started talking about the sound barrier.
Artillerymen knew better. Starting with Ernst Mach in the 19th centuryAlternative meaning: Nineteenth Century (periodical ( 18th century — 19th century — 20th century — more centuries) As a means of recording the passage of time, the 19th century was that century which lasted from 1801- 1900. Events The Little Ice Age ended, they were aware that after a point the drag no longer increased, and in fact dropped again. The challenge then became how to provide this amount of power. With the introduction of the swept wingA swept-wing is a wing planform used on high-speed aircraft that spend a considerable portion of their flight time in the transonic. Simply put, a swept-wing is a wing that is bent back at some angle, instead of sticking straight out from the fuselage. to lower drag, and the jet engineA jet engine is a type of air-breathing turbine engine, often used on aircraft. The principle of all jet engines is essentially the same. The engine draws air in at the front and compresses it. The air is combined with fuel, typically ignited by flame in to provide the power, by the 1950s a number of aircraft were able to fly supersonically with relative ease. Charles Elwood YeagerBrigadier General Charles Elwood Yeager (born February 13, 1923 in Myra, Lincoln County, West Virginia) is a former World War II ace and test pilot. He is most famous for being the first human to undeniably travel faster than sound. Yeager was born into a was the first person to break the sound barrier on October 14October 14 is the 287th day of the year (288th in Leap years). There are 78 days remaining. Events 1066 Norman Conquest: Battle of Hastings In England on Senlac Hill, seven miles from Hastings, the Norman invasion forces of William the Conqueror defeat th 1947Events January January 1 British mines nationalized January 1 Nigeria gains limited autonomy January 1 The Canadian Citizenship Act went into effect January 3 Proceedings of the United States Congress are televised for the first time. January 10 United Na, flying the experimental Bell X-1The Bell X-1 was the first aircraft to exceed the speed of sound in controlled, level flight. It was the first of the so called X-planes, a series of aircraft designated for testing of new technologies and usually kept highly secret. On October 14, 1947, at MachMach number Ma is defined as a ratio of speed to the speed of sound in the medium in case. The Mach number is commonly used both with objects travelling at high speed in a fluid, and with high-speed fluid flows inside channels such as nozzles, diffusers o 1 at an altitude of 45,000 feet. Hans Guido Mutke claimed to have broken the sound barrier before Yeager, on April 9 1945 in a Messerschmitt Me 262. However, this claim is disputed by most experts and lacks a scientific foundation.