The ratio of a rocket engine's thrust
to the weight of fuel burned in one second. Measured in seconds, specific
impulse is an important gauge of the efficiency of a rocket propulsion system
and, in particular, of a rocket propellant.
It is similar to the idea of miles per gallon with cars. The higher its
value, the better the performance of the rocket.
|The ranges of specific impulse and
thrust for different types of propulsion system