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originally posted by: tinymind
a reply to: buddha
Had you ever considered the possibility of the gasses expansion actually "pushing" against the inside of the engine as it is allowed to escape out the rear.
The thrust actually is measured against the motor.
The hot exhaust gas flows through the rocket nozzle and is accelerated to the rear of the rocket. In re-action, a thrusting force is produced on the engine mount. The thrust accelerates the rocket as described by Newton's second law of motion.
bus the gas has very low mass.
and it would be moving away from the rocket.
so it could not push on it much.
But in the vacuum of space you have Nothing to push against.