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Questions about specific impulse (Isp), which is a comparative measure of efficiency of rocket, jet engines and used propellants, measured either in seconds of thrust per unit weight of propellants, or effective exhaust velocity (thrust per unit mass of propellants) as a measure of launcher system's specific energy efficiency.
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Understanding Von Braun's Math: Theoretical Isp
I guess that it goes approximately like this: assume that the enthalpy change (I'll denote it $\Delta H$) is fully converted to the kinetic energy of the exhaust and the exhaust moves with velocity $v …