Linked from
The 17 pages that link to Specific impulse, each with the reason it gives.
Rocket engineRelated: It compares how effectively different engines turn propellant into thrust.
ThrustRelated: It compares how effectively different propulsion systems turn propellant into thrust.
Jet engineRelated: It compares how effectively engines turn consumed propellant into thrust.
Jet propulsionRelated: It compares how effectively different jet systems use propellant.
RamjetRelated: It is a standard way to compare ramjet propellant efficiency with other engines.
Multistage rocketRelated: Engine efficiency affects how much velocity each stage can contribute.