Specific Impulse by NASA Glenn Research Center (source code)

= Specific Impulse by NASA Glenn Research Center
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https://www1.grc.nasa.gov/beginners-guide-to-aeronautics/specific-impulse/

Sections Thrust Equation and Specific Impulse: momentum flux, nozzle pressure correction, equivalent exhaust velocity and standard-gravity convention. The displayed intermediate division has a typographical grouping error; use the preceding thrust equation and F = mass-flow times equivalent velocity.