ocr: What is the sound barrier? A loudspeaker creates high pressure by pushing air forward with its paper cone. As an airliner travels forward through the air, its nose creates high pressure in the same way. In both cases, the area ofhigh pressure spreads outward at the speed of sound. If the airliner itself is traveling at the speed of sound, it catches up with the high pressure. Pressure steadily builds up in front of the airliner, making it very difficult for it to travel any faster. To pierce this high pressure, an airliner needs to have a sharp-nosed shape with swept-back wings. SUPERSONIC AIR ...
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