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The velocity of gaseous or other particles in the exhaust stream of the nozzle of a reaction engine, relative to the nozzle.
exhaust
A rocket exhaust nozzle that can be aimed in any direction.
To increase the exhaust velocity.
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Pressure, not velocity. A gas flowing through a divergent nozzle gains pressure at the cost of speed.
There are too many to mention The ones that are exclusive to the harrier are Nozzle angle Water Injection (%) and Nozzle EGT (Exhaust gas temp)