Because the total weight of a rocket is strongly dependent on the amount of propellant it must carry and because increasing the propellant exhaust velocity decreases the amount of propellant mass required, the propellant exhaust velocity that can be produced by a given propulsion system has special significance. In fact, the exhaust velocity is used to define a new quantity called specific impulse (I sp ) which is used as a major figure of merit for any propulsion system.

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