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NakoL1 t1_it91lxa wrote

Reply to comment by Miss_Understands_ in How does exit area for a rocket nozzle affect thrust? by jofwu

Your assumption that the exhaust is high pressure is wrong

Generally, you want to design the nozzle so that the exhaust pressure matches the ambient pressure. So the exhaust is very fast, but low pressure. At least, that's the case by the time it leaves the nozzle (at the throat, it's high pressure, low speed, before undergoing controlled dilatation in the nozzle)

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