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Quieter Aircraft

Date- 6th April 09 Source- 'Air transportation is vital to our economic health and quality of life, but that prosperity comes at a price: noise pollution. Many components of an aircraft contribute to noise pollution, particularly the nozzles of jet engines. The exhaust gases exiting the engine through the nozzle are a significant source of noise, particularly on takeoff. Nozzles produce hot, high speed air that contributes to thrust. This air interacts with the ambient air cooler, and traveling at a lower speed. You can hear the result..'
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