Eli5 how decreasing the diameter of the nozzle (of a rocket for example) makes the rocket go faster? It’s still the same amount of gas exiting the rocket no matter the diameter, so why is there a difference?
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Turbines and rocket engines produce high pressure gas at the exhaust. Without a nozzle, that gas would be ejected and then expand in the atmosphere behind the craft without producing much thrust. A nozzle converts the high pressure gas into a stream of gas shooting out at or near ambient pressure, where most of the energy is now moving the gas out of the nozzle and thus producing thrust.
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