Give short answer for the following question:
 
Describe rocket propulsion.
 
The propulsion of rockets is based on the and
Rocket propulsion:
An  is generated in the combustion chamber to balance this momentum, making the rocket project . The rocket's mass decreases with altitude, resulting in the progressive in velocity of the rocket.
 
The acceleration of a rocket depends on three important factors: , the rate the exhaust is ejected, and the .