underexpansion

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Neoclassical realism — is a theory of international relations. It is a combination of classical realist and neorealist (particularly defensive realist) theories. Neoclassical realism holds that the actions of a state in the international system can be explained by… … Wikipedia
convergent-divergent nozzle — An arrangement in which the forward portion of the nozzle is convergent, which increases the pressure of the exhaust gases, while the aft section is divergent to increase gas velocity to the supersonic speed and avoid losses from underexpansion.… … Aviation dictionary

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